Beerenberg in the context of "Volcanic crater"

Jan Mayen (Urban East Norwegian: [jɑn ˈmɑ̀ɪən]) is a Norwegian volcanic island in the Arctic Ocean with no permanent population. It is 55 km (34 mi) long (southwest-northeast) and 377 km (146 sq mi) in area, partly covered by glaciers (an area of 114.2 km (44.1 sq mi) around the Beerenberg volcano). It has two parts: larger northeast Nord-Jan and smaller Sør-Jan, linked by a 2.5 km (1.6 mi) wide isthmus. It lies 600 km (370 mi) northeast of Iceland (495 km [305 mi] NE of Kolbeinsey), 500 km (310 mi) east of central Greenland, and 900 km (560 mi) northwest of Vesterålen, 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 and is defined by geologists as a microcontinent.

Nordlaguna is a lagoon on the island of Jan Mayen. It is the second largest lake of Jan Mayen, after Sørlaguna, and is located in the central part of the island, near the bay of Stasjonsbukta. It was possibly formed by an eruption of Beerenberg volcano in 1732. Before isolation from the ocean 220 calyr BP what is now the Nordlaguna basin was a marine bay for about 2200 years. Before this, in a timespan between 2200 and 2400 calyr BP, it was mostly isolated from the ocean. This lake or lake-like period was preceded by at least 300–400 years of marine conditions.

Its deepest part lie in the southeast reaching 36 m below sea level.