Kohamajima Island
Protected Area
西表石垣
Why dive here
With 428+ marine species recorded in the area - including bull sharks, manta rays, mobula rays (devil rays), seahorses and sea turtles - Kohamajima Island offers some of Ishigaki & Yaeyama's richest diving. Water ranges 23-30°C, warmest July, August, September.
Kohamajima Island is a decent choice for an easy afternoon dive, especially if you’re fresh off the boat. The depth stays around 18 metres, making it really comfortable for newer divers or those who just want to cruise without worrying about deco. What we’ve seen here are some of the smaller reef dwellers: nudibranchs working their way along the corals, plenty of clownfish darting in and out of anemones, and sometimes a shy cuttlefish if you have a keen eye. It’s a site that rewards a slow pace, letting you really look into the nooks and crannies. We often suggest it as a second dive after something a bit more active, or as a gentle introduction to the Yaeyama islands.
Typical Kohamajima Island Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Always perform a 3-minute safety stop at 5m before surfacing.
Nearest Dive Centres to Kohamajima Island
Dive shops near Kohamajima Island
SEA LIGHT
WAKE UP CALL
海講座
BLUE SEASON IRIOMOTE
MOANA Diving College ISHIGAKIJIMA
Blue Water
Reviews for Kohamajima Island
Conditions
Ocean conditions, forecast and tides for Kohamajima Island
Kohamajima Island Ocean Conditions
Monthly averages for Kohamajima Island, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (24.6, 124.35) (10km away)
October Averages
Sea Temperature
29°C
84°F · Range: 27–30.4°C
Air Temperature
26°C
79°F
Wind Speed
7.74 m/s
15.0 knots
Atmospheric Pressure
1013.6 hPa
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data
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