Una Una Volcano Reef

Una Una Island, Togean Islands, Central Sulawesi, Indonesia

The reef around Una-Una, a small volcanic island in the Togean archipelago, Tomini Bay (N Sulawesi). Reef walls circle the undersea flanks with dense schools of batfish, bigeye trevally, reef sharks, and occasional hammerheads. Depths 10-40 m. Moderate current.