

Best for beginner divers, 5-18m, boat entry, moderate current.
Koh Si is a reef and cave site located off Phi Phi Leh, Thailand. The site features a varied topography suitable for beginners, with depths ranging from 5 to 18 metres and an average depth of 12 metres. Access is strictly by boat, as the site is situated 1000 metres from the shore. Divers and snorkellers can expect water temperatures between 28 and 31C. Conditions include moderate currents and visibility typically ranging from 10 to 20 metres. Hazards at this location include the potential for strong currents, low visibility, and the presence of sharks. Guided tours are available through local dive shops.
7.95740, 98.80750
The north side of the island features a steep wall adorned with sun corals, sea sponges, and sea whips.
Accessible by boat from Ao Nang beach.
Recorded at this site
Depth
5-18m
Visibility
10-20m
Skill Level
Beginner
Entry
Boat
Boat required
Water Temp
28-31°C
Current
Moderate
Typical Dive
45 min
Best Time
Jan, Feb, Mar, Apr, Dec
Yes, the site is classified as suitable for beginner divers.
The depth ranges from 5 to 18 metres, with an average depth of 12 metres.
No, Koh Si is located 1000 metres from the shore and requires boat access.
Yes, Koh Si is suitable for both diving and snorkelling activities.
Hazards include strong currents, low visibility, and the presence of sharks.
Diving at Koh Si in Ao Nang requires the following certifications: Open Water. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Koh Si in Ao Nang. Water temperatures range from 28°C to 31°C.
The best months to visit Koh Si in Ao Nang are January, February, March, April, and December. Conditions outside these months can still be good but are less predictable.
Expect moderate currents at Koh Si in Ao Nang. Good buoyancy control and some drift diving experience is helpful.
Visibility at Koh Si in Ao Nang typically ranges from 10 metres to 20 metres. Conditions vary with weather, tides, and seasons.