Philippine Sea The Philippine Sea is a marginal sea east and north of the Philippines occupying an estimated surface area of 2 Million mi² (5 Million km²) on the western part of the North Pacific Ocean. It is bordered by the Philippine archipelago (Luzon, Samar, Leyte and Mindanao) on the southwest; Palau, Yap, and Ulithi (of the Carolines) on the southeast; the Marianas, including Guam, Saipan, and Tinian, on the east; the Bonin and Iwo Jima on the northeast; the Japanese islands of Honshu, Shikoku, and Kyūshū on the north; the Ryukyu Islands (Okinawa, Miyako, and Yaeyama) on the northwest; and Taiwan in the extreme west.
The sea has a complex and diverse undersea relief. The floor is formed into a structural basin by a series of geologic faults and fracture zones. Island arcs, which are actually extended ridges protruding above the ocean surface due to plate tectonic activity in the area, enclose the Philippine Sea to the north, east and south. The Philippine archipelago, Ryuku Islands, and the Marianas are examples. Another prominent feature of the Philippine Sea is the presence of deep sea trench, among them the Philippine Trench and the Mariana Trench, containing the deepest point on the planet.