The Philippine oceanic plate is in contact with the Eurasian Plate to the south of Japan, resulting in a subduction zone marked by the Ryukyu Trench and the Nankai Trough. Volcanic island arcs have resulted to the northwest of the trenches. The Ryukyu Islands are a relatively young island arc compared with the mature arc of the Japanese islands of Honshu and Hokkaido, which has grown to a considerable land mass. The Ryukyu Islands include Okinawa, home to a large American naval base.
- Length 868 miles (1,398 km)
- Maximum Depth 24,476 ft (7,460 m)
- Rate of Closure 2.5-3 in (6-8 cm) per year