Mount Terror is a large shield volcano that forms the eastern part of Ross Island, Antarctica. It has numerous cinder cones and domes on the flanks of the shield and is mostly under snow and ice. It is the second largest of the four volcanoes which make up Ross Island and is somewhat overshadowed by its neighbor, Mount Erebus, 30 km (19 mi) to the west. Mt. Terror was named in 1841 by Sir James Clark Ross for his second ship, the HMS Terror. The captain of Terror was Captain Francis Crozier who was a close friend of Ross.