Geography of the North Sea

In the east, it connects to the Baltic Sea via the Skagerrak and Kattegat, narrow straits that separate Denmark from Norway and Sweden respectively.

In the north, it opens in a widening funnel shape to the Norwegian Sea, which lies in the very north-eastern part of the Atlantic.

It is mainly a deep erosional scour, while the western part follows the north–south line of an old rift valley formed during the Jurassic and Cretaceous periods.

To the east of Great Britain, lies the Dogger Bank, a vast moraine, or accumulation of unconsolidated glacial debris, which rises up to 15 to 30 m (49 to 98 ft) deep.

[9] The Devil's Hole is a group of trenches 200 kilometres (120 mi) east of Dundee, Scotland which are up to 230 metres (750 ft) deep.