In the 20th century, south of the Danish island Rømø lay the small island Jordsand, which sank in 1999. North of the Danish island Fanø the sand coast has been opened and closed numerous times in the course of history, but at the moment the coast line is closed, and forms a whole again except for two west coast fjords. The Danish islands have a total surface of 193.8 km² (74.5 sq. mi.) and 4,173 inhabitants.
