Pacific Ocean width at about 5°N latitude, where it stretches approximately from Indonesia to the coast of Colombia—halfway around the world, and more than five times the diameter of the Moon. The lowest known point on Earth—the Mariana Trench—lies below sea level. Its average depth is , putting the total water volume at roughly . Due to the effects of plate tectonics, the Pacific Ocean is currently shrinking by roughly per year on three sides, roughly averaging a year. By contrast, the Atlantic Ocean is increasing in size. Along the Pacific Ocean's irregular western margins lie many seas, the largest of which
Philippines and the Spratly Islands are occupying and/or controlling ten features, (seven islands, three reefs): By comparison, within the Spratly Islands: Also, the Philippines has some features that are "virtually occupied". These are features that lie in very close proximity to Philippine-occupied features, and can be seen within the horizon. (A 15 meter-height vision gives about of horizon distance). These include: North Reef, Sandy Cay, Loaita Nan and Loaita Cay. Also, most features that lie to the east of the 116°E, though not necessarily occupied, are largely controlled by the Philippines. The Philippine assertion of sovereignty over the Spratly Islands began in May 1956, when