Ross established the general geography of this region, and named many of its features; the Ross Sea, the Great Ice Barrier (later renamed the Ross Ice Shelf), Ross Island, Cape Adare, Victoria Land, McMurdo Sound, Cape Crozier and the twin volcanoes Mount Erebus and Mount Terror. He returned to the Barrier several times, hoping to penetrate it, but was unable to do so, achieving his Farthest South in a small Barrier inlet at 78°10′, in February 1842. Ross suspected that land lay to the east of the Barrier, but was unable to confirm this.