Island
An island or isle is any piece of sub-continental land that is surrounded by water. Very small islands such as emergent land features on atolls can be called islets, skerries, cays or keys. An island in a river or a lake island may be called an eyot or ait, and a small island off the coast may be called a holm. A grouping of geographically or geologically related islands is called an archipelago, such as the Philippines.
Channel Islands
Under the UK Interpretation Act 1978, the Channel Islands are deemed to be part of the British Islands, not to be confused with the British Isles. For the purposes of the British Nationality Act 1981, the “British Islands” include the United Kingdom (Great Britain and Northern Ireland), the Channel Islands and the Isle of Man, taken together, unless the context otherwise requires.