A key or cay is another name for a small island or islet. An island in a river or lake may be called an eyot. There are two main types of islands: continental islands and oceanic islands. A grouping of geographically and/or geologically related islands is called an archipelago.
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Depending on how long ago the continental island formed, the life on that island may have diverged greatly from the mainland due to natural selection. Humans have lived on and traveled between islands for thousands of years at a minimum.
Island, any area of land smaller than a continent and entirely surrounded by water. Islands may occur in oceans, seas, lakes, or rivers. A group of islands is called an archipelago. Islands may be classified as either continental or oceanic. Learn more about islands in this article.