Henry W. Coe State Park (or Coe Park for short) is a state park of California, USA, preserving a vast tract of the Diablo Range. It is located in Santa Clara and Stanislaus counties. The park contains over 89,000 acres (36,000 ha), making it the largest state park in northern California, and the second-largest in the state (after Anza-Borrego Desert State Park). Managed within its boundaries is a designated wilderness area of about 22,000 acres (8,900 ha). This is officially known as the Henry W. Coe State Wilderness, but locally as the Orestimba Wilderness.