Ammarqua Strait Ammarqua Strait Ammarqua Strait (old spelling: "Angmarqua") is a strait in the southern part of the Upernavik Archipelago in the Qaasuitsup municipality in northwestern Greenland. The strait separates Nutaarmiut Island from four large islands in the east, Uilortussoq Island and Saninngassoq Island in the north; Nako Island and Akuliaruseq Island in the south. The Eqalugaarsuit Suulluat Fjord opens into Ammarqua Strait immediately to the east of the southern cape, to the north of Kangeq Peninsula off the mainland of Greenland. At the southern mouth of the strait at the confluence with Baffin Bay are two islands: the Ineraq Island and
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