The asteroid belt is the region of space between the orbit of Mars and Jupiter. The scientist believes that most of the asteroids in our solar system found in this region. It is also known as the main asteroid belt or main belt and the four largest asteroids in this region are : Ceres, Vesta, Pallas, and Hygiea.
To read more about the asteroid belt, follow this link : http://en.wikipedia.org/wiki/Asteroid_belt