A large unnamed area of young basaltic lava flows and a possible small cinder cone is located on the floor of the Ethiopian Rift Valley SW of Tullu Moje volcano, which produced the dark-colored obsidian lava flow at the top-center of this Landsat image. The basaltic flows occupy a NE-SW-trending zone near the active eastern margin of the rift valley, NE of Lake Zwai (lower left) and NW of the 4,000-m-high Pleistocene Ch'llalo (Cilallo) volcano (lower right). NASA Landsat image, 1999 (courtesy of Hawaii Synergy Project, Univ. of Hawaii Institute of Geophysics & Planetology).