An irregularly shaped body with approximate maximum dimensions of 28 km (E-W) by 19 km (N-S) and a surface area of 10,400 ha, Lake Sentani is by far the largest of the Irian Jaya lakes. It is fed by a catchment area of about 600 km2 and has one outlet only, via the Jafuri and Tami rivers to the Pacific Ocean near the Papua New Guinea border.
Lake Sentani, near Jayapura at the NE extremity of Irian Jaya, lies at an elevation of 73 m in a fault-controlled depression mainly in Mesozoic mafic and ultramafic rocks of the Cyclops Ophiolite Belt. It is bounded by the Cyclops Mountains block to the north and the lower-standing terrain of the New Guinea fold thrust belt to the south.
It is in Sentani District on an area of 9,360 Ha and of 75 m above the sea level. It is a beautiful lake decorated by the hilly islands.
There are kinds of fish live in the lake, such as: mujair (kind of freshwater fish widely stocked in inland water), gabus (widely eaten freshwater fish), lele (freshwater catfish), tawes (kind of freshwater fish), ikan mas (goldfish), ikan sembilan (fish with poisonous spirus), and gurami fish.
It is 20 km from the town and reachable by vehicles.
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