It is estimated that our world has over 180,000 islands. By definition, land surrounded by water. Many, many of them uninhabited, as they are tiny, inhospitable, or overly volcanic. Canada has the world’s largest uninhabited island, Devon Island in Nunavut, with an area of over 21,000 sq. miles. Other than private islands, the world’s smallest inhabited island is reported to be Bishop Rock off the coast of England, inhabitants – 1 lighthouse keeper. The smallest Island country is Nauru, with almost 300 inhabitants, and an area of just over 8 sq. miles. Greenland is the world’s largest island. One in 9 of the world’s inhabitants live on an island.
http://www.worldislandinfo.com/SUPERLATIVESV2.html
notestoponder 
And sometimes, one can be an island.