Sol asteroid belt

The Sol asteroid belt was a band of more than 7,000 asteroids found between the orbits of Mars and Jupiter in the Sol system, located in Sector 001 of the Alpha Quadrant.

Ten of these asteroids had diameters larger than 250 km. The largest was the planetoid Vesta at 933 km.

History
The planetoid Ceres lay within the belt. (FASA RPG module: Star Fleet Intelligence Manual: Agent's Orientation Sourcebook)

Wrigley's Pleasure Planet was one of the asteroids. Its interior was hollowed out to build parks and special theme centers. 

The 21st century Earth colony-ship  followed a trajectory between the orbits of Venus and Uranus. During its first pass by the asteroid belt, colonists traded supplies for ore and industrial goods with several mining craft.