Jan Mayen is a volcanic island in the Arctic Ocean located at the border of the Norwegian Sea and the Greenland Sea. The single island covers an area of and is dominated by the tall Beerenberg volcano. The island's only population is a combined military and meteorological outpost that operates a LORAN-C transmitter at Olonkinbyen. The Norwegian Meteorological Institute annexed the island for Norway in 1922. On 27 February 1930, the island was made de jure a part of the Kingdom of Norway. Since 1994, the island has been administrated by the County Governor of Nordland, with some authority delegated to the station commander.