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 (31 and 59 miles) wide and up to 700 metres (2,300 ft) deep. Off the Rogaland coast it is 250–300 metres (820–980 ft) deep, and its deepest point is off Arendal where it reaches 700 metres (2,300 ft) deep – an abyss compared to the average depth of the North Sea, which is about 100 metres (330 ft).