Top Hidden Anchorages In Thailand Known Only By Yacht

The short answer: these spots are all about tide, shelter, and timing. If I were planning this trip, I’d focus on November through April, use a yacht to reach places day boats miss, and time hong and cave entries around a 2–6.5-foot (0.5–2-meter) tide swing.

Here’s the full picture in plain terms:

• I’m looking at 10 anchorages across Phang Nga Bay, the Racha Islands, Phi Phi Don, and Koh Yao Noi
• The best picks change based on overnight shelter, crowd levels, and tide access
• Phang Nga Bay is the top area for hidden lagoons, cave passages, and tight tide windows
• Koh Racha Yai is better for clear water and overnight stays after day boats leave
• Koh Racha Noi is more exposed and works better as a day stop
• Loh Lana and Laemtong Beach are quieter Phi Phi options for the night
• Koh Yao Noi’s offshore anchorages give some of the best all-around shelter and privacy
• Park fees in the article run from about ฿200 to ฿400 per person, paid in cash

What stood out to me most is how little distance matters compared with access. Some stops are only a few miles apart, but a one-hour tide window, a shallow mud flat, or a cave ceiling can change the whole plan.

Sailing around the Caves of Thailand – Phuket’s Limestone Islands Ep 238

Quick Comparison

Bottom line: if you want the best hidden anchorages in this part of Thailand, I’d match each stop to tide height, wind direction, and overnight shelter first, then fit scenery and swim stops around that.

What Makes An Anchorage ‘Known Only By Yacht’

The islands may be familiar. The anchorage often isn’t.

We’re talking about the tucked-away cove, narrow channel, or sheltered corner that yacht crews know about and most other visitors miss. For these places to work, three things matter: access, shelter, and timing.

As yacht captain Barry Latchford put it:

“It’s certainly in neither of the bibles, those guides written for Rough and Lonely people; nor the Pilot. You really do have to go looking for it to find it.” ^[5]

The pattern is pretty clear. Land access is limited. Protected water keeps conditions calm. Development stays light. In practice, that often means mangroves, limestone, and rainforest blocking roads, natural barriers cutting swell, and very little built up along the shore.

Some of the most striking cases are the hong anchorages, where even getting in depends on the tide.

For hong anchorages, tide-dependent entry is the main limit. Hong means “room” in Thai: enclosed lagoons inside limestone karsts, reached through narrow sea tunnels during a 2–3 hour mid-tide window.^[10] Go in too early and the cave ceiling is underwater. Go in too late and the rocky bottom can make passage impossible.

Grenville Fordham, author of the Southeast Asia Pilot, described one such passage as:

“The entrance is an 80-meter pitch-dark passageway leading to a completely enclosed circular, cathedral-like ‘hong’… the ethereal glow makes it seem as if you were encased inside an emerald.” ^[6]

What turns a quick stop into a yacht anchorage is overnight potential. Day boats usually run on set schedules. Once that traffic clears out, these spots can go completely quiet.^[5][11] That mix of shelter, hard-to-reach access, and late-day silence sets up the first stop below.

1. Koh Hong, Phang Nga Bay

At Koh Hong, timing is everything. The island sits about 16 miles from Yacht Haven Marina, inside Ao Phang Nga National Park. Its name means “room” in Thai, which makes sense once you see the hidden lagoon. Getting in takes a bit of care: you pass through a narrow cave entrance, and that only works during the right mid-tide window. ^[2][1][12]

Shelter and holding

The main anchorage is in about 40 feet (12 meters) over mud, with good holding in both monsoon seasons. There’s also a shallower spot in 13–16 feet (4–5 meters) just outside the cave entrance. ^[2]

One thing to watch: stay clear of the shallow bank west of Koh Na Khae. The passage between Koh Yai and Koh Na Khae is suitable only for shoal-draft vessels. ^[2]

Access by tender or kayak

You’ll need to enter by kayak or sea canoe only. Motorized dinghies are banned here to protect the bats and the cave area. ^[1][2]

Inside, the lagoon is about 330 feet (100 meters) across and ringed by limestone walls that rise to about the same height. It feels less like an anchorage stop and more like slipping into a stone courtyard made by nature. ^[10]

Traffic and privacy level

This place changes a lot depending on the hour. Commercial tour boats from Phuket and Krabi usually show up between 10:00 AM and 3:00 PM. If you’re anchored and set to go by 7:30–8:00 AM, you’ll often get the lagoon almost to yourself. ^[8]

Best season or tidal window

November through April is the steady season, with the calmest conditions from November through February. For access, aim for the 2–3 hour mid-tide window, when the entrance is open but not underwater. ^[8][9][10]

The park fee is 400 baht per person, and rangers collect it in cash. ^[2][1]

From Koh Hong, the route narrows as you push deeper into Phang Nga Bay at Koh Phanak.

2. Koh Phanak

Koh Phanak is a long, narrow island with four peaks that stand out from either direction of approach ^[14]. Inside its limestone cliffs, it hides several named caves, including Bat Cave, Ice Cream Cave, Diamond Cave, and Mangrove Cave ^[16]. For yacht guests, the big draw is simple: quiet. Once the day traffic fades, the hongs feel still and almost sealed off from the rest of Phang Nga Bay. Koh Phanak also has longer cave passages and a tighter tide window than some of the bay’s easier stops.

Shelter and holding

Koh Phanak has different sheltered bays depending on the monsoon season ^[13]. In the northeast monsoon, the southwest and northwest bays give good holding in about 13–16 feet (4–5 meters) over mud ^[14]. In the southwest monsoon, the east bay is the better place to shelter ^[14].

If you’re coming from the south, keep an eye out for a drying rock about one mile west of the island’s southern tip ^[14]. That matters because most crews don’t stop here just to anchor. They anchor for cover, then wait for the right tide window to reach the cave-linked hong inside the island.

Access by tender or kayak

The main attraction is a cave tunnel about 660 feet (200 meters) long that leads into a hidden hong ^[18]. You can get in by kayak or tender, but outboard motors are banned inside ^[13][15].

Bring:

• a waterproof flashlight
• a helmet

The tunnel stays dark for more than 50 meters, and some sections have low stalactites ^[15][16]. Timing matters too. Access is tide-sensitive, with only about a one-hour window around mid-tide ^[14][16]. Miss that slot, and you may be waiting for the next tide cycle.

Traffic and privacy level

Day-trip boats can bring in up to 150 visitors at once at the cave entrances ^[13][15][18]. Early morning, late afternoon, and overnight are usually much quieter ^[13][15][18].

Best season or tidal window

Try to go just after high tide, as the water starts to fall ^[13][17]. That usually gives enough depth to clear the cave ceiling without leaving you stuck in mud. The national park fee is about 200 baht per person, collected on-site by rangers ^[19].

From here, the route continues to Koh Roi, where the anchorages get smaller and quieter.

3. Koh Roi

East of Koh Phanak, Koh Roi is smaller, quieter, and a bit trickier to anchor.

This uninhabited island sits inside Ao Phang Nga National Park and has no facilities at all. What draws people here is the hidden hong, reached through a cliff opening that’s easy to miss if you don’t know where to look. It tends to stay calmer than Koh Hong, and that low-profile entrance, along with the tight anchorage, tends to favor yachts that arrive early and time the tide well.

Shelter and holding

The southwest-facing bay is about 19 miles from Yacht Haven Marina. Depths are around 26–39 feet (8–12 meters) over mud with some rock patches. Stay fairly close to the island, since shallow water stretches a long way to the west. There’s only enough room for three or four yachts. ^[20][21]

Watch for the hidden rock off the southern point, and avoid the gap between Koh Roi and the rock stack to the northwest. ^[20][21]

Access by tender or kayak

Fringing coral makes tender landings hard at low tide. At low water, you can reach the hong on foot from the northwest beach. Around mid-tide, a swim-in may be possible. At high tide, the entrance can close off. ^[20][21][22]

Wear sturdy shoes. The ground inside is rough and uneven. ^[22]

Traffic and privacy level

Koh Roi sees fewer visitors than nearby stops, though afternoon longtail boats still show up. ^[21] If you want the place at its quietest, get in early.

At dusk, a colony of giant fruit bats leaves the cliffs and heads toward the mainland to forage. It’s one of those moments that sticks with you. ^[21][24]

Best season or tidal window

“This is a great anchorage in the northeast season and reasonable in the southwest season.” – Southeast Asia Pilot ^[20]

This anchorage works best in the northeast monsoon. The high cliff walls also help soften conditions during the southwest season. ^[20][23][24] The national park fee is about 200 baht per person, collected on-site. ^[25]

Koh Kudu Yai lies 1.5 to 1.7 nautical miles to the east. ^[21][22]

4. Koh Kudu Yai

East of Koh Roi, Koh Kudu Yai swaps tight hong access for an anchorage that’s easier to use. It sits about 20 miles from Phuket Yacht Haven and about 2 miles (3 kilometers) off the north tip of Koh Yao Noi. It also tends to stay off the standard tour circuit.^[23][7]

That lower traffic shows right away. There are no shops, toilets, or vendors, so the island feels much quieter than the busier stops nearby. Even the beach is small, stretching only about 165 feet (50 meters).^[7][26]

Shelter and holding

The usual spot is the channel between the islands, where 16–26 feet (5–8 meters) of mud bottom gives good holding. The northern end and western side have the best protection.^[23][27]

There is one catch: wind can squeeze through the gap and kick up chop. Because of that, overnight stays make more sense when conditions are light.^[23][27] The tall cliffs help in another way too. They start giving natural shade at about 4:00 PM.^[28]

Access by tender or kayak

For the hongs and sea caves, use a dinghy or kayak. The southern hong is too shallow for sailing yachts, and boats have grounded there before.^[23] So that area is the main hazard, not the main place to land.

You’ll want to come prepared since there are no services onshore:

• Bring your own water
• Pack snacks
• Carry sun protection

The national park entrance fee is usually 300 baht per person.^[7]

Traffic and privacy level

Day speedboats usually start to fade out by late afternoon.^[1] By dusk, the mood changes again when a colony of giant fruit bats lifts out of the northeast bay.^[27]

Best season or tidal window

The calmest stretch is usually November through April.^[26][23] For hong access and beach landings, aim for mid- to high tide. At low tide, the bay gets shallow.^[7][3]

If you’re coming in from the south, take it slow. Ao Muang’s mud flat extends offshore.^[27]

From here, the route continues toward the Racha Islands.

5. Koh Racha Yai

Koh Racha Yai is busy during the day and quiet after sunset. The island lies about 12 nautical miles south of Chalong Pier ^[29][30]. That shift matters. Once the day boats head back, it turns into a practical place to stay overnight instead of just a quick stop.

Shelter and holding

Where you anchor depends on the monsoon.

During the northeast monsoon, from November through April, the west-facing bays offer the best cover. Raya Bay, at Patok Beach, and Siam Bay to the north are the main options ^[32]. In the outer part of Raya Bay, holding is in 49–82 feet (15–25 meters) over sand and calcified coral ^[4]. The inner bay is shallower, but most of it is taken up by permanent moorings, so space to anchor is limited.

In the southwest monsoon, from May through October, Ter Bay on the east coast gives the better protection. Depths there run 33–66 feet (10–20 meters) over broken coral and sand ^[29]. Currents can be strong, so this isn’t the kind of spot where you want to get sloppy with your setup.

Access by tender or kayak

Getting ashore is fairly easy in high season. There are jetties at both Raya Bay and Ter Bay ^[4][29]. If you use the resort jetty at Raya Bay, keep close to the beach so you don’t get in the way of resort transfer boats ^[4].

Ter Bay has another handy feature: a walking track that takes about 20 minutes and runs through coconut plantations to the north and west beaches ^[29][4]. That gives you direct shore access without much hassle. One place to skip altogether is the northern bay – sailors are advised not to enter it ^[31].

Traffic and privacy level

The daytime traffic can feel busy, but it eases off later in the day. By late afternoon, most day boats leave and the anchorage settles down.

Best season or tidal window

The crossing from southern Phuket can get rough when wind pushes against the tide ^[4]. The best time to visit is November through April.

Next comes Koh Racha Noi, where shelter drops off and the anchorage is more exposed.

6. Koh Racha Noi

From Koh Racha Yai, head farther south to Koh Racha Noi for a quieter, more exposed stop. The island sits about 20 miles south of Phuket and is completely uninhabited. There are no resorts, restaurants, piers, cell signal, or internet ^[33][36]. With no jetties, access is tender-only. Once you drop anchor, you’re off-grid.

Shelter and holding

Your anchorage depends on the season. During the northeast monsoon, from November to April, the west coast is the better pick, especially Banana Bay. In the southwest monsoon, from May to October, the east coast is the safer option.

Banana Bay shelves from 16 to 82 feet (5 to 25 meters) over rocky coral ^[36]. The east coast is deeper, running 49 to 66 feet (15 to 20 meters) ^[4]. Across the island, the seabed is mostly rocky or coral stone, so holding can be less dependable than the sandy patches at Koh Racha Yai ^[4][35].

Access by tender or dinghy

There are no jetties here, so every landing is by tender or dinghy. When the water is calm, the beaches are easy enough to reach.

One detail that helps: there’s a small gap on the west side of the island that you can pass through by dinghy, but only at high tide ^[4]. Since there are no shore facilities at all, bring what you need before you arrive, especially food, water, and a garbage bag for flotsam and jetsam ^[4][34].

Traffic and privacy level

Because the island is farther out, the anchorages are deeper, and the currents can run hard, day traffic stays light. On many days, you’ll have the bay to yourself or share it with only a handful of boats.

Best season or tidal window

November through April is the most reliable time to come. Seas are usually calmer, and underwater visibility often reaches 82 to 98 feet (25 to 30 meters) ^[36].

If seeing manta rays is part of the plan, aim for February through April. That’s when oceanic mantas with wingspans of 10 to 13 feet (3 to 4 meters) are often spotted at the South Tip ^[36]. It’s also smart to leave Phuket in the morning, since afternoon winds can make the return crossing rough ^[37].

From here, the route turns back toward Phuket’s south side.

7. Koh Hae (Coral Island)

Koh Hae lies 5.5 miles southeast of Phuket’s south coast. It gets busy during the day, then settles down once the tour boats head out. Speedboats from Chalong Pier usually make the trip in 15–20 minutes, while yachts often stay overnight for the quiet. So even though it’s close, timing and berth choice matter a lot.

Shelter and holding

For more privacy, head to the quieter southern bays. Banana Beach gives you the best shelter from wind, with calm water backed by cliffs and sand patches that work for anchoring. Anchor only on sand patches so you don’t damage the coral. ^[38][40][41]

Access by tender or kayak

There are no docks here, so you’ll need to go ashore by tender or by wading in shallow water. ^[39] The island is busiest from 10:30 AM to 1:00 PM, and it tends to feel much calmer after 3:00 PM.

Best season or tidal window

The best time to visit is from November through April. From May through October, the water is choppier and visibility drops. ^[39][42][43]

From Phuket’s south side, the route then continues east to Loh Lana, Phi Phi Don.

8. Loh Lana, Phi Phi Don

Compared with Phi Phi’s busier southern bays, Loh Lana is the quiet overnight pick on the island’s northwest side. It sits on Phi Phi Don’s northwest coast and faces north. There are no beach bars, no umbrellas, and no working resort facilities, so it feels a long way from Ton Sai. An abandoned resort onshore adds to that remote feel, and getting here takes either a 30-minute boat ride or a 45- to 60-minute hike from Tonsai Village, which helps keep boat traffic light ^[45][46].

Shelter and holding

The bay has good holding over sand, and most yachts anchor in about 33 feet (10 meters) of water. There are also several moorings available ^[47]. High cliffs on both sides help cut down swell, which means the bay usually stays calmer than Ton Sai during the northeast monsoon ^[46][48].

Traffic and privacy level

Loh Lana is one of the least visited bays on Phi Phi Don. At low tide, larger tour boats can’t get in, and the lack of facilities keeps things quiet ^[45][46][48]. When traffic is light, leopard sharks, also known as zebra sharks, are sometimes spotted here ^[48].

Access by tender or kayak

Most guests come ashore by tender or kayak, then take a footpath to the main track and reach Loh Ba Kao in about 15 minutes ^[44][47]. Snorkeling near the mooring is good, but crews should watch for sea urchins in the shallows when landing ^[47][48].

Best season or tidal window

The best time to use this anchorage is during the northeast monsoon, when it gets the most shelter ^[47][48]. Swimming is best at high tide because the bay becomes very shallow at low tide. On the flip side, the coastal trail over to Nui Beach is only passable at low tide ^[45][46].

From Loh Lana, the route continues to Laemtong Beach on Phi Phi Don’s northeast side.

9. Laemtong Beach, Phi Phi Don

Laemtong is a north-end anchorage on Phi Phi Don that you can reach by yacht. It’s roadless, a bit cut off, and the monsoon sets the rules. The beach sits on the island’s northern tip, about 15 miles from Ao Nang, where Phi Phi Don narrows to just 590 feet (180 meters). Four resorts line the shore, but there are no roads and no shops. You can get there from Tonsai Village by a 1-hour hike or a 30–45-minute boat ride. That setup makes wind direction the main thing to watch.^[49][50]

Shelter and holding

During the southwest monsoon, anchor in 26–33 feet (8–10 meters) of water off Erawan Palms and Zeavola. The bottom is sand, and holding is excellent.^[47]

During the northeast monsoon, use Ao Lanah on the west side instead, then walk the ridge across to the beach.^[47]

Access by tender or kayak

Time your shore trips with the tide. At spring low tide, about 650 feet (200 meters) of tidal flats dry out. That exposes a fringing reef, which makes tender landings poor. There’s no dedicated dinghy dock on the beach side. The only pier is a concrete one on the rocky western shore, reached by a short walk across the island’s narrow neck.^[47][50]

Traffic and privacy level

Laemtong feels calmer than Tonsai, which is part of the draw. Still, resort transfer boats and day boats move through the area all day.^[49][51]

Best season or tidal window

The southwest monsoon is the best time to anchor off Laemtong. If you’re coming from the north, stay clear of Hin Klang, south of Koh Mai Phai (Bamboo Island).^[47]

From here, the route shifts west toward Koh Yao Noi’s offshore anchorages.

10. Koh Yao Noi Offshore Anchorages

West of Phi Phi, Koh Yao Noi has a few offshore anchorages that work best when you pay close attention to tides and wind direction. Each one has its own role. Northwest Bay is the most flexible, Ao Muang is the easiest for getting ashore at any tide, and Chong Koh Yao matters most if you’re making a channel transit.

Shelter and holding

Northwest Bay has 13–16 feet (4–5 meters) over mud and is reliable in both seasons. It sits on the outer edge of a deep bay. ^[3]

Ao Muang has 33–39 feet (10–12 meters) over mud and is a better pick in the southwest monsoon. When strong northeast winds blow in, it can turn uncomfortable. ^[3][52]

Chong Koh Yao has 23–33 feet (7–10 meters) east of Hin Klang Rong. This is a tide-sensitive channel passage, so timing matters. Only pass through when high tide gives you at least 1.6 feet (0.5 meters) more than your draft. ^[3]

Access by tender or kayak

Getting ashore changes a lot with the tide. At low tide, Northwest Bay dries far offshore, which makes shore access a hassle. ^[3]

Ao Muang is much easier. A floating jetty sits on the northern edge of the bay, and a channel marked by wooden sticks leads to it, so you get all-tide access. ^[3][52]

Just north of Ao Muang, Ao Pho Noi is better as a tender stop than a main anchorage. It’s a nice spot to poke around by tender, with limestone cliffs and mangroves nearby. ^[3]

Traffic and privacy level

If you want peace and quiet, Chong Koh Yao isn’t the first place I’d choose in the middle of the day. Speedboats from Phuket and Krabi pass through there during daylight hours, with the busiest stretch around midday. ^[12]

Northwest Bay and Ao Pho Noi are quieter by comparison. Ashore, dress modestly and keep alcohol on the boat.

Best season or tidal window

Northwest Bay works in both seasons. ^[3] Ao Muang is the better option in the southwest monsoon, while strong northeast winds can make both Ao Muang and Koh Nok uncomfortable. ^[3][52]

Rangers patrol north of Koh Yao Noi, and the entry fee is 400 baht per person per day, paid in cash. ^[1][2]

Anchorage Comparison At A Glance

Each stop does a different job. These anchorages fit into three main groups: Phang Nga Bay’s limestone hongs, the clear-water Rachas, and the quieter Phi Phi and Koh Yao Noi stops. This quick snapshot helps you pick the right place based on shelter, privacy, or tide-linked access.

The main differences come down less to the islands themselves and more to tide, exposure, and how quiet you want the night to be.

A few patterns stand out fast.

• Koh Racha Noi is the only strict day-use stop. Its rocky bottom makes overnight anchoring impractical ^{[4] [54]}.
• Phi Phi’s Loh Lana and Laemtong Beach give up central access in exchange for calmer, quieter nights ^[53].
• Koh Racha Yai is the best bet for snorkeling thanks to its clearest water ^[4].
• For limestone drama and hidden lagoons, Koh Hong, Koh Phanak, and Koh Roi offer far more than the Racha islands when the tide lines up ^{[1] [8]}.
• If your main goal is the best mix of shelter and seclusion in both monsoon seasons, Koh Yao Noi’s offshore anchorages stand out ^[3].

In plain terms, this isn’t just about picking the prettiest island. It’s about matching the anchorage to your boat and your plan. Want cave access? Tide matters. Want a calm night? Exposure matters. Want to feel like you’ve got the place to yourself? Then seclusion matters more than scenery.

The best stops here aren’t just hidden. They’re time-sensitive and vessel-dependent. Pick based on your top priority: tide access, shelter, or seclusion.

How To Plan A Yacht Route Through Thailand’s Hidden Bays

Think of the ten anchorages above as three linked cruising loops, not stand-alone stops. That makes planning much easier because each area has its own rhythm for tide, shelter, and overnight timing.

From there, shape each day around the season and the tide window that suits that cluster.

Route choice can change fast when the wind shifts. Season is the first filter. The northeast monsoon, from November through April, is the best cruising window. The southwest monsoon brings rougher open-water conditions, although Phang Nga Bay stays more sheltered.

In Phang Nga Bay, tide matters more than mileage. Build the day around the tide window, not the chart distance. Andaman tides often top 6.5 feet (2 meters) in a single day, and hong entries like Koh Phanak’s bat tunnel need a tide height of 1.5–2.0 meters for safe passage ^[9]. Miss that slot, and the tunnel becomes unsafe or closed.

Plan every leg for daylight and aim to anchor before late afternoon. That means your swim stops, transit legs, and overnight anchorage need to work as one chain, not as separate choices. A simple example from the Phi Phi cluster: anchor overnight at Laemtong Beach, then sail to the north coast at 06:30, and clear out by 09:30 before the day-trip boats show up ^[9].

Distance isn’t the main issue here. Precise timing is. The simplest rule is to match each anchorage to tide, shelter, and overnight timing.

Conclusion

Thailand’s best anchorages come down to three things: tide timing, shelter, and local route knowledge.

Phang Nga Bay’s hongs, the clear-water stops around Racha, and the quieter overnight bays near Phi Phi and Koh Yao Noi all move to their own rhythm. To get the best from each one, you need to match the anchorage to the tide, the season, and your overnight plan.

What matters most isn’t just how far you can go. It’s what that access gives you: silence, shelter, and time.

That’s why, in this cruising ground, timing matters more than distance. The best spots tend to favor crews who read the tide, arrive early, and know the route. For yacht crews, the payoff is simple: the right anchorage at the right tide.

FAQs

How much yacht experience do I need for these anchorages?

You don’t need any yachting background to enjoy these hidden anchorages.

That said, getting into them isn’t always simple. Many of these spots depend on exact tidal timing, local know-how around shallow reefs, and the skill to pass through narrow sea caves.

That’s why a private yacht charter is the best way to visit them. Your crew takes care of the navigation, timing, and boat handling, so you can relax and enjoy the trip.

How do I safely time hong and cave access?

Timing matters a lot, because hong and sea cave entrances can sit underwater at high tide or become too shallow at low tide. In most places, mid-tide is the safest time to go.

Overhead clearance can get VERY tight, so entry and exit need to be timed with care. It also helps to go with an experienced guide who knows the cave system well. Early morning or late afternoon often brings fewer crowds and more comfortable conditions.

Which anchorages are best for an overnight stop?

For overnight stays, pick anchorages that give you solid cover from monsoon winds and sudden squalls.

• Northwest Bay, Koh Yao Noi: well protected in both seasons, with good holding in 13–16 feet
• Ao Muang, Koh Yao and Koh Khlui East: best during the southwest monsoon
• Middle Passage: works in either season
• Southeast bay of Koh Muk and the west-coast bays of Koh Ngai: dependable in the northeast monsoon