Bisoke Volcano, 3,711 m above sea level is located on the DRC and Rwanda border. An eruption in 1957 formed two small cones on the north flank of the volcano, 11 km from the summit, which supports a beautiful crater lake, Lake Ngezi. Hiking to the crater lake requires four hours up a steep trail from the Bisoke departure point, to reach the summit. The walk around the crater lake rim is highly recommended. Allow seven hours for the entire trip. Lake Ngezi a small, shallow crater lake, is the easiest hike in the park; it takes only three to four hours round-trip from the Bisoke departure point.