Adwa (also known as Aabida, Amoissa, or Dabita), is a broad stratovolcano in the southern Afar area immediately east of the younger vegetated Ayelu volcano. It has a roughly 3 x 4 km caldera that originated following eruption of voluminous ignimbrites, with a trachytic dome extruded in the eastern part of the caldera. Scoria cones are located on the floor of the caldera and on its NW and SW flanks. Extensive young basaltic lava flows cover the flanks and overlap a sedimentary plain to the SE. Many fumaroles occur within the caldera. Satellitic pyroclastic cones and lava domes were considered to be only a few hundred years old (Mohr 1980, pers. comm.). Dark lava flows originating from cones about 4 km from the caldera rim on the SW flank cover more than 50 km2.