England's Isle of Ely is a small island located in the Cambridgeshire Fens in eastern England. It is known for its rich history and culture, as well as its beautiful landscape. The island has been inhabited since the Iron Age and was once the capital of the Kingdom of East Anglia. Today, it is a popular tourist destination, with many attractions such as Ely Cathedral, Oliver Cromwell's House, and the Ely Museum. The answer to the crossword puzzle is 'ELY', which is the three-letter abbreviation for the island.