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Ang Thong Islands

The rocky karst formations of this north-south string of islands – similar to those of Phang Nga Bay – has been declared a marine National Park. The many high, sheer-sided islands with narrow passages between them offer lots of scenic cruising.
The water is rather murky and there are no detailed charts of this group, so take note of the two warning boxes below.

Ang Thong Group

During the calm season several tour boats bring tourists to these islands from Samui. They are popular with Thai tourists, since ‘Mu Ang Thong’ (Golden Bowl) is on the list of ‘must see’ places for any Thai who wants to say he’s seen the entire country.

Fishing boats also seek shelter amongst the steep, protective islands here. There are not many beaches, and so only a few places to go ashore.

  • A


19 miles from Ao Nathon, Samui

KOH WUA TA LAP. 9° 38.097N, 99° 40.479E

Anchor in 8 metres on a muddy bottom on the northeast side of the island. Approach from the north or east giving Koh Phi plenty of clearance to avoid underwater reefs.

If you feel like a hike, a 45-minute climb takes you to a viewpoint overlooking the islands. Shoes and water are a must! South of the main beach is a huge cave; keep an eye open for wild monkeys and bats. Since this (often referred to as Koh Ang Thong on tourist maps) is the main island in the group, the National Park HQ has some bungalows and there is a fee of 500 baht per person.

Rocks in the water

Heading north from Koh Wua Ta Lap to Koh Mae Ko, north of the southern-most beach, there is a coral head right in the middle of the passage. it is possible to pass on either side of 

  • B


1 mile from Koh Wua Ta Lap

KOH MAE KO. 9° 39.515N, 99° 40.034E

Approaching from the northeast, on a course of approximately 230°, north of Koh Sam Sao and Koh Ao Raet, avoids all rocks on the way into the anchorage. Koh Ao Raet is referred to as ‘Sphinx Island’ or ‘Koh Hanuman’ by local tour operators due to its rock formation profile.

Approaching from the southeast, there is a large rock mid-channel, which should be left to starboard. Off a small beach is a red buoy, which marks an underwater rock. Here there is a small platform which offers access to a path leading to an inner lake, and a cave under the mountain. (Emerald Lake)

The next beach northwards now has a small jetty giving access to the island and jungle pathways and is the main tourist drop‑off, making this the better option. Look for a good anchorage in about 7-8 metres off this third beach coming from the south, on the east side of the island.

  • C


5 miles from Koh Wua Ta Lap

KOH LIM. 9° 42.350N, 99° 40.620E

The anchorage is well off the island on the northeast side in 10 metres on a hard bottom. It is not suitable for overnight stays. This island, at the northern end of the group, away from the worst of the riverine sediment from the west, has reasonable coral formations in limited visibility.

Rocks in the water

Between Koh Mae Ko and Koh Hanuman (aKa Koh Ao Raet or Sphinx Island) there is a sharp point of rock just beneath the surface which is only visible at extreme low tides.

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While every effort has been made to ensure that the information contained in this book is accurate, the charts of anchorages are based on personal experience and satellite imagery and are intended as a guide only. They should not be used for navigation. Please refer to Official Hydrographic Charts of the respective countries.

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