The term for a small piece of land surrounded by water is an island. Islands can vary significantly in size, from tiny islets to large land masses like Greenland. They can be formed through various geological processes, including volcanic activity, sediment deposition, or rising sea levels. Islands can be found in oceans, seas, rivers, and lakes. The unique ecosystems of islands often lead to diverse flora and fauna, some of which may be endemic, meaning they are found only in that particular region. Additionally, islands are often popular tourist destinations due to their natural beauty and recreational opportunities, such as diving and beach activities.