These are the land pieces surrounded by water Island are of different sizes. Examples of big Island are Australia and Antarctica, while Fauna is the smallest one. Island may be an ocean, sea, river or lake Island can be divided into three groups that continental, Oceanic and barrier. Famous long Island off the coast New York are long narrow strips of land that lie parallel to coastline they are made up of sand, silt and gravel. In olden days Islands were considered as a place to send criminals or unwanted people to spend exiled life, but today islands are considered as dreamland for spending memorable holidays.