Dive-site story
Located in Lake Biwa, Okishima is Japan's only inhabited freshwater lake island and offers a rare inland diving experience. The underwater landscape consists of silt slopes, submerged tree branches, and rocky boulders where endemic lake species congregate. Divers explore freshwater habitats devoid of tides and ocean currents, encountering curious lake fish amid tranquil freshwater conditions.
Exploring the freshwater ecosystem of Japan's largest ancient lake
Encountering native freshwater fish species around submerged rock clusters and wood debris
Experiencing the serene atmosphere of diving around an inhabited lake island
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Summer and early autumn provide warmer water temperatures and more active fish behavior.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biwa CatfishSilurus biwaensis | Seasonal | ||||||||||||
| Largemouth BassMicropterus salmoides | Common | ||||||||||||
| Freshwater GobyRhinogobius sp. | Common | ||||||||||||
| Lake Biwa AyuPlecoglossus altivelis altivelis | Seasonal |
Marine forecast
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