Grand Cayman is the largest of the three Cayman Islands at about 196 km² and contains the capital George Town. Towns on the island are referred to as 'districts'. The island is a high-lying reef of 'ironshore' (limestone fringes with numerous marine fossils), with a highest elevation of roughly 24 meters above sea level. There is no natural fresh water (lakes, rivers, etc) on the island, so any fresh water needs must be met by catchments or desalination of seawater. The lack of rivers does however account for the exceptional clarity of the sea.
Grand Cayman claims many other tourism attractions other than Seven Mile Beach. Grand Cayman is particularly well known for spectacular diving and snorkeling. The island features many reefs and walls, some of which can be accessed by swimming from shore.