Nakadomari is an archaeological site of the prehistoric and early modern periods in Onna, Okinawa. It is a complex site that includes remains of the Early Kaizuka Period Phase IV and V and Late Kaizuka Periods, as well as of the early modern Ryukyu kingdom. It is located on a limestone outcrop about 30 m high, along the coast, near the border between Nakadomari and Yamada in Onna. A river runs from the hills behind to the sea. The site was designated and a National Historic Site in 1975