While an island is surrounded by water on all sides, a peninsula is bordered by water only on three sides. A peninsula will always be connected to the mainland on one side. Peninsulas can be small, or very large. They are found on every continent.
In Europe, Portugal and Spain form the Iberian Peninsula. The Horn of Africa, which juts into the Arabian Sea, is a huge peninsula. The nations of North Korea and South Korea make up the Korean Peninsula in Eastern Asia.
In Australia, there is the Cape York Peninsula. And of course, the Indian subcontinent forms a huge peninsula, bordered by the Arabian Sea, the Bay of Bengal, and the Indian Ocean.
