Map - Jan Mayen (Jan Mayen)

Jan Mayen is a Norwegian volcanic island in the Arctic Ocean with no permanent population. It is 55 km long (southwest-northeast) and 373 km2 in area, partly covered by glaciers (an area of 114.2 km2 around the Beerenberg volcano). It has two parts: larger northeast Nord-Jan and smaller Sør-Jan, linked by a 2.5 km wide isthmus. It lies 600 km northeast of Iceland (495 km [305 mi] NE of Kolbeinsey), 500 km east of central Greenland, and 900 km 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.

Although administered separately, in the ISO 3166-1 standard, Jan Mayen and Svalbard are collectively designated as Svalbard and Jan Mayen, with the two-letter country code "SJ".

Jan Mayen Island has one exploitable natural resource, gravel, from a site located at Trongskaret. Other than this, economic activity is limited to providing services for employees of Norway's radio communications and meteorological stations located on the island. Jan Mayen has one unpaved airstrip, Jan Mayensfield, which is about 1585 m long. The 124.1 km coast has no ports or harbours, only offshore anchorages.

There are important fishing resources, and the existence of Jan Mayen establishes a large exclusive economic zone around it. A dispute between Norway and Denmark regarding the fishing exclusion zone between Jan Mayen and Greenland was settled in 1988 granting Denmark the greater area of sovereignty. Geologists suspect significant deposits of petroleum and natural gas lie below Jan Mayen's surrounding seafloors.