Round Valley Regional Preserve is just outside of Antioch, CA. The land had been used for farming and ranching for 100 years until it was sold to the East Bay Regional Parks District in 1988. The old dirt roads are now used for horseback riding, cycling, and hiking. It is a picturesque old California farmland experience. The preserve is also home to the California ground squirrel, the San Joaquin pocket mouse, desert cottontails, and the endangered San Joaquin kit fox.