

Best for beginner divers, 5-35m, boat entry, moderate current.
Koh Hah consists of five limestone islands offering a diverse topography of reefs, walls, pinnacles, and caverns. Depths range from 5 to 35 metres, with an average of 22 metres. The site features overhead environments within the cavern sections, requiring a torch and guide for safe exploration. Conditions vary, with visibility between 5 and 30 metres and moderate currents. Water temperatures remain warm, typically between 28 and 31 degrees Celsius, though thermoclines may occur. Access is by boat only, and the site is suitable for both diving and snorkelling. Due to the depth and overhead hazards, divers should be aware of risks including nitrogen narcosis and decompression.
7.92360, 98.80383
Book a guided tour rather than a self-guided charter if you are relatively new to diving, as the cavern sections and depth variation here genuinely benefit from a guide who knows the site. Visibility is at its best in the dry season months, but Koh Hah dives year-round and is worth visiting at any time.
35 minutes by speedboat or 2 hours by large dive boat from Koh Lanta Yai.
Recorded at this site
Depth
5-35m
Visibility
5-30m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
28-31°C
Current
Moderate
Typical Dive
45 min
Best Time
Jan, Feb, Mar, Apr, Nov, Dec
The site ranges from 5 to 35 metres deep, with an average depth of 22 metres.
While shallower reef sections are accessible, the cavern features and depths reaching 35 metres require advanced certification and guided supervision.
Koh Hah is located 20 kilometres from shore and requires boat access via a guided tour or charter.
Yes, the site is suitable for both diving and snorkelling activities.
Hazards include overhead environments in caverns, potential nitrogen narcosis at depth, and sharp coral, sea urchins, stonefish, and lionfish on the reef.
Diving at Koh Hah in Koh Phi Phi requires the following certifications: Open Water, Advanced. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Koh Hah in Koh Phi Phi. Water temperatures range from 28°C to 31°C.
The best months to visit Koh Hah in Koh Phi Phi are January, February, March, April, November, and December. Conditions outside these months can still be good but are less predictable.
Expect moderate currents at Koh Hah in Koh Phi Phi. Good buoyancy control and some drift diving experience is helpful.
Visibility at Koh Hah in Koh Phi Phi typically ranges from 5 metres to 30 metres. Conditions vary with weather, tides, and seasons.