An island or isle (/ˈaɪl/)'s any piece of land that's surrounded by water. Very small islands such as emergent land features on atolls are called islets. A key or cay's another name for a small island or islet. An island in a river or lake may be called an eyot, /ˈaɪ.ət/. There're two main types of islands: continental islands and oceanic islands. There're also artificial islands. A grouping of geographically and/or geologically related islands's called an archipelago.… (More on Island)