Tasmantid Seamounts

Lying 150-600 km east of the Australian mainland is a 2000 km long chain of submerged volcanoes rising over 4000 m above the seafloor, or nearly twice the height of the highest mountain on the Australian mainland. These undersea mountains, the Tasmantid Seamounts, are extinct volcanoes formed from around 40 until 6 million years ago above a mantle hotspot, similar to the Hawaiian Islands.