"Burdell Mountain rises 1,558 feet from the Novato Valley floor on the northeast corner of Marin County. The serpentine slopes are covered with rolling grasslands and groves of live oak, bay laurel, and buckeye. Two major parks reside on Burdell Mountain: Olompali State Historic Park occupies 700 acres on the northeast face (Hike 121), while Mount Burdell Open Space Preserve occupies 1,600 acres on the southwest slope (this hike). The hike forms a loop on the southwest flank of the mountain, from the lower meadows to the ridge separating the two parks. At the summit are sweeping vistas that span from Mount Saint Helena to Mount Diablo and San Francisco. En route, the hike visits Hidden Lake (a seasonal pond midway to the summit), an old stone wall built by Chinese laborers in the late 1800s, and remnants of old rock quarries once used for the streets in San Francisco. The trails are open to hikers, cyclists, and equestrians."