Lake Kutubu is the second-largest lake in Papua New Guinea, after Lake Murray, and, at 800 m above sea level, the largest upland body of water, with an area of 51.84 km2 (20.02 mi2), and a total catchment area of 328.3 km2 (126.8 mi2). Lake Kutubu and Lake Sentani form an ecoregion on the WWF's Global 200. Kutubu lies in the Southern Highlands Province of Papua New Guinea, east of the Kikori River into which it drains, and about 50 km southwest of Mendi, the provincial capital. It is one of the few lakes in the country that occurs in a depression in the rugged interior mountains. The lake has a few islands, the largest of which is Wasemi in its northern part. The water of Lake Kutubu, fed by several streams originating mostly from underground sources, is clear and reaches a depth of 70 m. The catchment is inhabited by two main ethnic groups, the Foe to the south and the Fasu to the north. Thirty-three villages lie in the catchment area, with a total estimated population of 10,885.