Profile of the World Age: 4.55 billion years old Total Area: 510.072 million sq km (196.940 million sq mi). Land Area: 148.94 million sq km (57.506 million sq mi). Water Area: 361.132 million sq km (139.434 million sq mi). Coastline: 356,000 km (221,208 mi). Land Boundaries: 251,060 km (156,262.58 mi.), not counting shared boundaries twice Climate: Two large areas of polar climates are separated by two rather narrow temperate zones from a wide equatorial band of tropical to subtropical climates. Terrain: Highest Elevation is Mt Everest at 8,850 m (29,035 ft) and lowest length depression is the Dead Sea at-411 m (1-1,349 ft) below sea level. The Greatest Ocean Depth is Mariana Trench at -10,924 m (-35,380 ft) in the Pacific Ocean.
