Beaufort's Dyke is a natural glacial-formed trench within the North Channel between Northern Ireland and Scotland. The dyke is 50 kilometres (25 nautical miles) long, 3.5 kilometres (2 nautical miles) wide and 200–312 m (700–1,000 ft) deep. The Dyke is one of the deepest areas of the European continental shelf.
The trench is recorded in 1856 as having been discovered "some years ago" by a Captain Beechey.
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The North Channel (known in Irish and Scottish Gaelic as Sruth na Maoile, in Scots as the Sheuch) is the strait between north-eastern Ireland and south-western Scotland. The Firth of Clyde merges with the channel, between the southern tip of the Kintyre peninsula and Corsewall Point on the Rhins of Galloway. Part of the Irish Sea, the channel begins north of the Isle of Man and runs north-west into the Atlantic Ocean. Within the channel is Beaufort's Dyke, the deepest part of which is 312 metres (1,024 ft).