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.
Archipelagic state
Archipelagic states are states that are composed of groups of islands forming a state as a single unit, with the islands and the waters within the baselines as internal waters. Under this concept ("archipelagic doctrine"), an archipelago shall be regarded as a single unit, so that the waters around, between, and connecting the islands of the archipelago, irrespective of their breadth and dimensions, form part of the internal waters of the state, and are subject to its exclusive sovereignty.