<P> Dallol is a cinder cone volcano in the Danakil Depression , northeast of the Erta Ale Range in Ethiopia . It has been formed by the intrusion of basaltic magma into Miocene salt deposits and subsequent hydrothermal activity . Phreatic eruptions took place here in 1926 , forming Dallol Volcano ; numerous other eruption craters dot the salt flats nearby . These craters are the lowest known subaerial volcanic vents in the world , at 45 m ( 150 ft ) or more below sea level . In October 2004 the shallow magma chamber beneath Dallol deflated and fed a magma intrusion southwards beneath the rift . An phreatic eruption occurred in January 2011 . </P>
dallol crater in the afar region of ethiopia
a cinder cone volcano in the Danakil Depression