An island or isle is a piece of sub-continental land completely 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. Sedimentary islands in the Ganges Delta are called chars. A grouping of geographically or geologically related islands, such as the Philippines, is referred to as an archipelago.

Aerial image of Süderoog, a privately owned island belonging to the Halligen group of islands in Germany

There are two main types of islands in the sea; continental and oceanic. There are also man-made islands.

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