Tuttorqortooq Island Tuttorqortooq Island Tuttorqortooq Island (old spelling: "Tugtorqortôq") is an uninhabited island in the Qaasuitsup municipality in northwestern Greenland. Tuttorqortooq Island is located in Tasiusaq Bay, in the north-central part of Upernavik Archipelago, at the mouth of Kangerlussuaq Icefjord, which separates it from Mernoq Island in the northeast. In the east, the northern tip of Qallunaat Island is separated from Tuttorqortooq by the narrow "Qaqqakassaup Ikerasaa" strait, widening into a bay to the southwest between the two islands. To the west, a small, rocky Horse Head Island buffers the island from the open waters of Baffin Bay. The island is mountainous,
Davis Strait Davis Strait is underlain by complex geological features of buried grabens (basins) and ridges, probably formed by strike-slip faulting during Paleogene times about 45 million to 62 million years ago. The strike-slip faulting transferred plate-tectonic motions in the Labrador Sea to Baffin Bay. It is the world's broadest strait. With a water depth of between one and two thousand meters the strait is substantially shallower than the Labrador Sea to the south or Baffin Bay to the north. The strait is famous for its fierce tides that can range from , which discouraged many earlier explorers. US Geological Survey has