To the southwest of the Japanese archipelago is Okinawa, made up of around 160 islands. Home to people from around 20 countries including America and a variety of Asian countries, the main island of Okinawa has a distinctly exotic feel. It is referred to as the island of entertainment, thanks to its rich culture of singing and dancing, and it plays host to a variety of events and festivals throughout the year. Okinawa enjoys a subtropical ocean climate and idyllic natural scenery, with coral reefs blessed by the warm seas of the Kuroshio Current. It also boasts a wealth of traditional craft treasured since the days of the Ryukyu dynasty, including the sanshin (a traditional three-stringed instrument) and ceramics, as well as historical remains, such as the world heritage sites of the Gusuku (fortress) and Related Properties of the Kingdom of Ryukyu.