Morgan Territory Regional Preserve, and the surrounding region are named for pioneer settler Jeremiah Morgan. Established in 1976, the East Bay Regional Park District (EBRPD) preserve's nearly 5,000 acres (20 km²) are an important wildlife and recreational corridor. It ranges east from Riggs Canyon and Mount Diablo State Park to the Contra Costa Water District's Los Vaqueros watershed and EBRPD's Round Valley Preserve. The original preserve was located on Morgan Territory Ridge, east of Morgan Territory Road, and included the headwaters of Marsh Creek. In the late 1980s, it was expanded across the parallel Highland Ridge west of the road and into Riggs Canyon.