Map references: World, Time Zones
Area: total: 510.072 million sq km land: 148.94 million sq km water: 361.132 million sq km note: 70.8% of the world's surface is water, 29.2% is land
Area - comparative: land area about 16 times the size of the US
Land boundaries: the land boundaries in the world total 251,480.24 km (not counting shared boundaries twice)
Coastline: 356,000 km
Maritime claims: contiguous zone: 24 nm claimed by most, but can vary continental shelf: 200-m depth claimed by most or to depth of exploitation; others claim 200 nm or to the edge of the continental margin exclusive fishing zone: 200 nm claimed by most, but can vary exclusive economic zone: 200 nm claimed by most, but can vary territorial sea: 12 nm claimed by most, but can vary note: boundary situations with neighboring states prevent many countries from extending their fishing or economic zones to a full 200 nm; 43 nations and other areas that are landlocked include Afghanistan, Andorra, Armenia, Austria, Azerbaijan, Belarus, Bhutan, Bolivia, Botswana, Burkina Faso, Burundi, Central African Republic, Chad, Czech Republic, Ethiopia, Holy See (Vatican City), Hungary, Kazakhstan, Kyrgyzstan, Laos, Lesotho, Liechtenstein, Luxembourg, Malawi, Mali, Moldova, Mongolia, Nepal, Niger, Paraguay, Rwanda, San Marino, Slovakia, Swaziland, Switzerland, Tajikistan, The Former Yugoslav Republic of Macedonia, Turkmenistan, Uganda, Uzbekistan, West Bank, Zambia, Zimbabwe
Climate: two large areas of polar climates separated by two rather narrow temperate zones from a wide equatorial band of tropical to subtropical climates
Terrain: the greatest ocean depth is the Mariana Trench at 10,924 m in the Pacific Ocean
Elevation extremes: lowest point: Dead Sea -408 m highest point: Mount Everest 8,850 m (1999 est.)
Natural resources: the rapid using up of nonrenewable mineral resources, the depletion of forest areas and wetlands, the extinction of animal and plant species, and the deterioration in air and water quality (especially in Eastern Europe, the former USSR, and China) pose serious long-term problems that governments and peoples are only beginning to address