Corfu, an island off Greece’s northwest coast in the Ionian Sea, is defined by rugged mountains and a resort-studded shoreline. Its rich culture reflects years spent under Italian, French and British rule before it was united with Greece in 1864. Beaches range from the fine sand and shallow waters of Ayios Georgios to the water sports and party atmosphere at Cavos. The island is bound up with the history of Greece from the beginnings of Greek mythology. Its Greek name, Kerkyra or Korkyra, is related to two powerful water symbols: Poseidon, god of the sea, and Asopos, an important Greek mainland river. The island's history is full of battles and conquests. Castles punctuating strategic locations across the island are a legacy of these struggles. Two of these castles enclose its capital, which is the only city in Greece to be surrounded in such a way. As a result, Corfu's capital has been officially declared a Kastropolis ("castle city") by the Greek government. Corfu is a very popular tourist destination. Corfu has a hot-summer Mediterranean climate.