Devil's Hole (North Sea)
The features, which were first charted by HMS Fitzroy, were officially recorded in the Royal Geographical Society's Geographical Journal in 1931. Soundings showed that the surrounding seabed is between 80 and 90 metres (260 - 300 ft) but the trenches are as deep as 230 m (750 ft). They run in a north-south direction and are on average between 1 and 2 km (.6 - 1.25 mi) in width and 20 to 30 km (12 - 18 mi) long.
Historically, fishermen have known about the Devil's Hole for generations because they have lost trawl nets on the trenches' steep sides. It is for this reason that the area took its name.
Dogger Bank for map and links to similar places