The North Sea is a semi-closed epicontinental shelf sea of about 750.000 km2 and a water depth varying from c. 30 to 100 and to 200 m between Norway and the UK. Several deeper depressions occur along the Norwegian coast, the Norwegian channel with water depth of up to 700 m and local depressions like the Outer Silver Pit with depth to 70 m and Devils Hole to 230 m.


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