The Philippine Sea is a marginal sea east and northeast of the Philippines occupying an estimated surface area of 5 million km² (2 million mi²). of the western part of the North Pacific Ocean. It is bordered by the Philippine archipelago (Luzon, Catanduanes, 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 Kyushu on the north; the Ryukyu Islands on the northwest; and Taiwan in the west.