

Best for intermediate divers, 10-30m, boat entry, mild current.
Koh Ran is a reef site located in the Koh Ngam Islands, Thailand, accessible only by boat. The reef structure descends from 10 metres to a maximum depth of 30 metres, with an average depth of 12 metres. Divers and snorkellers can expect mild currents and visibility ranging from 10 to 25 metres. Surge and swell can develop, which may impact boat entry and exit; it is recommended to time these movements carefully. This site is suited for intermediate divers, with typical dives lasting around 45 minutes. Water temperatures remain warm throughout the year, ranging between 28 and 31 degrees Celsius.
10.77935, 99.53095
Keep an eye on sea state before committing to the boat trip, as swell can pick up and affect your time on the reef. If conditions look unsettled, check with the local operator about sheltered sections of the reef that may offer a more stable dive.
1 hr boat from Chumphon
Recorded at this site
Depth
10-30m
Visibility
10-25m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
28-31°C
Current
Mild
Typical Dive
45 min
Best Time
Mar, Apr, May, Jun, Jul, Aug, Sep
The site is rated for intermediate skill levels, primarily due to potential surge and swell conditions that can affect boat entry and exit.
The reef depth ranges from 10 metres down to 30 metres, with an average depth of 12 metres.
Koh Ran is located 17 kilometres from shore and requires boat access.
Yes, Koh Ran is suitable for both diving and snorkelling activities.
Visibility generally ranges from 10 to 25 metres with mild currents. However, surge and swell can develop, so it is important to monitor sea states.
Diving at Koh Ran in Chumphon requires the following certifications: Open Water. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Koh Ran in Chumphon. Water temperatures range from 28°C to 31°C.
The best months to visit Koh Ran in Chumphon are March, April, May, June, July, August, and September. Conditions outside these months can still be good but are less predictable.