What are Tropics? The Tropics are a region of the Earth surrounding the Equator, roughly defined as the area between the Tropic of Cancer in the Northern Hemisphere at 23.43663°N and the tropic of Capricorn in the Southern Hemisphere at 23.43663° S. According to the State of the Tropics 2014 Report, the tropical region accounts for 40 per cent of the Earth’s total surface area … [Read more...] about Key Facts and Statistics about the Tropical Zone of Earth