what is meant by eyot or ait, or a holm ?
* An island 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, or a holm.
* A grouping of geographically or geologically related islands is called an archipelago, e.g. the Philippines.
* An island may be described as such despite the presence of an artificial land bridge, for example Singapore and its causeway, or the various Dutch delta islands, such as IJsselmonde.
* Some places may even retain "island" in their names for historical reasons after being connected to a larger landmass by a wide land bridge, such as Coney Island or Coronado Island.
* Conversely, when a piece of land is separated from the mainland by a man-made canal, for example the Peloponnese by the Corinth Canal, it is generally not considered an island.
* There are two main types of islands: continental islands and oceanic islands. There are also artificial islands.