Lake Sentani is a tropical, shallow, and at low-altitude open lake located at the northeast extremity of the Intan Jaya Regency in the Indonesian province of Papua, about 20 kilometres (12 mi) from the provincial capital, Jayapura City.
The lake, which is considered by the local population as the home of the rainbows, is part of the Cyclops Strict Nature Reserve and contains many species of fish that cannot be found anywhere else in the world.