Site 4 of the Asal–Ghoubbet rift. A. View towards the west and Lake Asal, showing plastic tubes installed by local inhabitants to collect fresh water. B. Satellite view, showing the area affected by the fumaroles with visible surface alteration in brown. C. View to Ghoubbet Bay, showing the eastern hydrothermal zone with numerous fumaroles and Afar condensation wells. The scarp of the N140°-oriented north-dipping normal fault clearly demonstrates the tectonic activity of this central part of the rift.