Norwegian trench

The Norwegian trench or Norwegian channel (Norwegian:Norskerenna; Danish:Norskerenden; Swedish:Norska rännan) is an elongated depression in the sea floor off the southern coast of Norway. It reaches from the Stad peninsula in Sogn og Fjordane in the northwest to the Oslofjord in the southeast. The trench is between 50 and 95 kilometres wide and up to 700 metres deep. Off the Rogaland coast it is 250 – 300 metres deep, and its deepest point is off Arendal where it reaches 700 metres deep – an abyss compared to the average depth of the North Sea, which is about 100 metres.