Ely is a city in Cambridgeshire, England, located on the River Great Ouse. It is the county town of Cambridgeshire and is known as the Isle of Ely due to its location on an island surrounded by marshes. The city has a rich history, having been the site of a monastery founded in 673 AD. Today, Ely is a popular tourist destination, with its cathedral, museums, and other attractions drawing visitors from around the world.