Wildcat Canyon Regional Park is a 2,429-acre (983 ha) East Bay Regional Parks District park located within the city limits of Richmond in Contra Costa County in the San Francisco Bay Area of California. It includes a portion of Wildcat Canyon as well as a portion of the adjoining San Pablo Ridge, and is directly connected to the more heavily used Tilden Regional Park. Tilden Regional Park, also known as Tilden Park or Tilden /ˈtɪldən/, is a 2,079-acre (841 ha) regional park in the East Bay, part of the San Francisco Bay Area in California. It is between the Berkeley Hills and San Pablo Ridge. Its main entrance is near Kensington, Berkeley, and Richmond. The park is contiguous with Wildcat Canyon Regional Park. The park contains numerous trails, providing facilities for hiking, horseback riding and bicycling. While most of the trails are dog-friendly. Dogs are not permitted in the Tilden Nature Area to the north of the park. Some of the main trails include: The Tilden Nature Area is the northern, undeveloped region of the park. It is a 740-acre preserve with 10 miles of hiking trails. These trails include a climb to Wildcat Peak and a trail and wooden boardwalk around Jewel Lake. Nimitz Way, a four-mile-long (6 km) paved trail (named after Admiral Chester W. Nimitz) that begins at Inspiration Point on the eastern edge of the park and heads north along the ridge of the hills, crossing into Wildcat Canyon Regional Park about two miles (3 km) in and ending at a peak above El Sobrante. Nimitz Way is very popular with hikers, runners and bicyclists, in part because it is paved and not very steep. From Nimitz Way there are excellent views of the San Francisco Bay to the west, EBMUD’s San Pablo & Briones Reservoirs, along with Mt. Diablo to the east. Unknown to most of the folks who travel this trail, the two-mile section that is in Wildcat Canyon Regional Park was a Nike missile base which was decommissioned in the 1970s. Today there are few signs of the missile silos and military housing that used to populate these hills.