Okinawa Prefecture is one of Japan's southern prefectures. It consists of hundreds of the Ryukyu Islands in a chain over 1,000 kilometres long, which extends southwest from Kyūshū to Taiwan. Okinawa's capital, Naha, is located in the southern part of Okinawa Island. The disputed Senkaku Islands are administered as part of Okinawa Prefecture. The island experiences temperatures above 20 °C for most of the year. Okinawa and the many islands that make up the prefecture contains some of the most abundant coral reefs found in the world. Rare blue corals are found off of Ishigaki and Miyako islands as are numerous species throughout the chain.