Nakagusuku Bay is a bay on the southern coast of Okinawa Island on the Pacific Ocean in Japan. The bay covers 220 square kilometres (85 sq mi) and ranges between 10 metres (33 ft) to 15 metres (49 ft) deep. The bay is surrounded by the municipalities of Uruma, Kitanakagusuku, Nakagusuku, Nishihara, Yonabaru, Nanjō, all in Okinawa Prefecture. In 1852, while visiting the Ryukyu Kingdom, Commodore Matthew Perry mapped Okinawa and labeled Nakagusuku Bay as "Perry's Bay". During the final months of World War II, the bay became a United States Navy forward base and was nicknamed "Buckner Bay".