The Bosphorus is a narrow strait in the middle of the Black Sea. It is the only link between the continents of Europe and the Middle East.

The strait was formed by the melting of ice during the Ice Age. It has been called the "Bosphorus Bridge" since it was built in the 17th century. It was named after the Greek word "bosphorus" which means "bridge" or "road" in Greek. The name is derived from the word bosphorus, which means a river or stream.