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
Ocean planet Ocean planet An ocean planet, ocean world, water world, aquaplanet or panthalassic planet is a type of terrestrial planet that contains a substantial amount of water either at its surface or subsurface. The term "ocean world" is also used sometimes for astronomical bodies with an ocean composed of a different fluid, such as lava (the case of Io) or ammonia (the case of Titan's inner ocean). Earth is the only known astronomical object to have bodies of "liquid" water on its surface, although several exoplanets have been found with the right conditions to support liquid water. For exoplanets, current technology