The complex Marum crater with its active lava pond (left) and the main crater Mbwelesu (right) as well as the Niri Mbwelesu pit crater near the rim of Marum (center), probably containing a crusted-over and active lava pond as well seen from the air. The smaller collapse pit Niri Mbwelesu Taten in the background S of Marum (Photo: Tom Pfeiffer)