Denmark Strait Atlantic Oceans runs from Straumnes to Cape Nansen, southwest of Cape Tunipier. From Straumnes to Cape Nansen the distance is . The narrow depth, where the Greenland–Iceland Rise runs along the bottom of the sea, is . The cold East Greenland Current passes through the strait and carries icebergs south into the North Atlantic. It hosts important fisheries. The world's largest known underwater waterfall, known as the Denmark Strait cataract, flows down the western side of the Denmark Strait. During World War II, the Battle of the Denmark Strait took place on 24 May 1941. The sank the British battlecruiser
Investigator Strait boundary with Gulf St Vincent is the line from Troubridge Point on Yorke Peninsula to Cape Jervis on Fleurieu Peninsula. Its boundary with Backstairs Passage is the line from Cape Jervis on Fleurieu Peninsula to Kangaroo Head (west of Penneshaw) on Kangaroo Island. Flinders noted that Backstairs Passage is a body of water separate to Investigator Strait. The boundary between the strait and Nepean Bay on the north-east coast of Kangaroo Island is a line between Point Marsden and Kangaroo Head. The Strait’s western boundary by definition is the line from Cape Spencer on Yorke Peninsula to Cape Borda on