Three Hummock Island is an island with an area of 70 km² (27 sq mi) and a high point 237 m (778 ft) above sea-level, in Bass Strait, south-eastern Australia. It is part of Tasmania’s Hunter Island Group which lies between north-west Tasmania and King Island. The island is named after its three most prominent hills, North, Middle and South Hummock, the latter being the highest. It is located near Hunter Island near the north-west coast of Tasmania. Part of the island is a nature reserve, with the rest a pastoral lease where farming took place from the mid-1800s to at least the mid-1970s. The focus of human settlement on the island is the homestead at Chimney Corner at the westernmost point. There is an automated lighthouse at Cape Rochon in the north-east, as well as roads, three airstrips, fencing and a wharf.