Svalbard & Jan Mayen

farther north, but are populated only by rotating groups of researchers.
The islands were first taken into use as a whaling base in the 17th and 18th centuries, after which they were abandoned. Coal mining started at the beginning of the 20th century, and several permanent communities were established. The Svalbard Treaty of 1920 recognizes Norwegian sovereignty, and the 1925 Svalbard Act made Svalbard a full part of the Kingdom of Norway. They also established Svalbard as a free economic zone and a demilitarized zone. The Norwegian Store Norske and the Russian Arktikugol remain the only mining companies in place. Research and tourism have become important supplementary industries, with the University Centre in Svalbard (UNIS) and the Svalbard Global Seed Vault playing critical roles. No roads connect the settlements; instead snowmobiles, aircraft and boats serve inter-community transport. Svalbard Airport, Longyear serves as the main gateway.
The archipelago features an Arctic climate, although with significantly higher temperatures than other areas at the same latitude. The flora take advantage of the long period of midnight sun to compensate for the polar night. Svalbard is a breeding ground for many seabirds, and also features polar bears, reindeer, the Arctic fox, and certain marine mammals. Seven national parks and twenty-three nature reserves cover two-thirds of the archipelago, protecting the largely untouched, yet fragile, natural environment. Approximately 60% of the archipelago is covered with glaciers, and the islands feature many mountains and fjords.
Svalbard and Jan Mayen are collectively assigned the ISO 3166-1 alpha-2 country code "SJ". Both areas are administered by Norway, though they are separated by a distance of over 950 kilometres (510 nautical miles) and have very different administrative structures.