The coastline of Norway is formed along the Skagerrak, North Sea, Norwegian Sea, and Barents Sea. This considers only the mainland coastline and excludes Svalbard. A straight line along Norway's sea borders (the coastal perimeter) is 2,650 kilometers (1,650 mi) long. Along the coast there are many fjords, islands, and bays, resulting in a low-resolution coastline of over 25,000 kilometers (16,000 mi). At 30-meter (98 ft) linear intercepts, this length increases to 83,281 kilometers (51,748 mi) (see the coastline paradox). Much of Norway's wealth is linked to its long coastline; for example, the petroleum industry, maritime transport, fishing, and fish farming.