The term for a body of land entirely surrounded by water is an "island." Islands can vary greatly in size, from small landmasses to large landforms such as Greenland. They can be found in oceans, seas, rivers, or lakes. Islands are formed through various geological processes, including volcanic activity, erosion, or the rising of the sea level that submerges surrounding land. Some islands are inhabited, with communities that rely on the surrounding water for resources, while others remain uninhabited and are important for biodiversity, serving as habitats for unique species.