1) Island of Denmark 
Birkholm is a small Danish island off the southern coast of Funen in Ærø Municipality. With an area of just 0.9 km2, as of 1 January 2010 it has a population of 10. The flat, low-lying island is just over 2 km long and 2 meters above sea level at its highest point, though the protective dykes are 2.8 meters high. It can be reached by post boat f...