Jan Mayen Island is a 55 km (34 miles) long (southwest-northeast) and 373 sq km (144 sq mi) in area arctic volcanic island in the Arctic Ocean, partly covered by glaciers (an area of 114.2 sq km around the Beerenberg). It has two parts: larger northeast Nord-Jan and smaller Sør-Jan, linked by an isthmus 2.5 km (1.6 mi) wide. It lies 600 km (about 400 mi) north of Iceland, 500 km (about 300 mi) east of central Greenland and 1000 km (about 600 mi) west of the North Cape, Norway. The island is mountainous, the highest summit being the Beerenberg volcano in the north. The isthmus is the location of the two largest lakes of the island, Sørlaguna (South Lagoon), and Nordlaguna (North Lagoon). A third lake is called Ullerenglaguna (Ullereng Lagoon). Jan Mayen was formed by the Jan Mayen hotspot.