The lake is located 43 kilometers south from Muhinga Town and 143 south west from Bujumbura Town. It has latitudes/longitudes of 2°21′-2°28′ S/30°16′ -30°22 ‘E with an altitude of 1750 meters above sea level.
The lake has an area of 6000 hectares and is 15 kilometers long and 8 kilometers wide at the northern end. The lake is shallow with its northern part intruding into Rwanda.
The southern and south western shores are forested areas while the western, northern and north eastern shores are swampy. The lake drains north east wards through short swampy tract to the Nyawarungu River.