Briones Reservoir

The Briones Valley is a major geological feature of Contra Costa County, California and runs between Mount Diablo and the county seat of Martinez. Also, it is the seat of many riparian watersheds, especially of Alhambra Creek.

The Black Hills are a mountain range in Contra Costa County, California.

The Charles W. Merrill House is a 6,000-square-foot residence built in 1938 and located in Orinda, California. Designed by regionally prominent architect Walter H. Ratcliff, of Berkeley, California for mining engineer and San Francisco businessman Charles Washington Merrill.

Lake El Toyonal (Spanish: Lago El Toyonal) is a small lake in Contra Costa County, California in an unincorporated area of parklands between Orinda and Berkeley.

Rancho El Sobrante was a 20,565-acre (83.22 km2) Mexican land grant in present-day Contra Costa County, California given in 1841 by Governor Juan Alvarado to Juan Jose Castro and Victor Castro. The name refers to a "surplus" in Spanish—the grant's boundaries were determined by the boundaries of the surrounding grants: San Antonio, San Pablo, El Pinole, La Boca de la Cañada del Pinole, Acalanes, and La Laguna de los Palos Colorados. This grant included the area between present day El Sobrante and Orinda.

Holden High School is a private, non-profit school located in Orinda, Contra Costa County, California, United States. Founded in 1969, it is accredited by the Western Association of Schools and Colleges and its diplomas are recognized by the State of California. The students are from all over the San Francisco Bay Area, and reflect the area's diversity.

Orinda Academy (OA) is a secondary school located in Orinda, California, United States.

Rancho Laguna de Los Palos Colorados was a 13,316-acre (53.89 km2) Mexican land grant in the Berkeley Hills (then called the Sierra de la Contra Costa, "Contra Costa Range") within present-day Contra Costa County, California. It was given in 1841 by Governor Juan Alvarado to Joaquín Moraga and his cousin, Juan Bernal. The name means "Ranch of the Lake of the Redwoods" in Spanish. The rancho included the present-day Orinda, Lafayette and Moraga, as well as the communities of Canyon and Rheem.

The Redwood Valley Railway is a 15 in (381 mm) gauge miniature railway in Tilden Regional Park near Berkeley, California.

Orinda is a city in Contra Costa County, California, United States. The city's population as of the 2020 census is estimated at 19,514 residents.

Tilden Regional Park, also known as Tilden Park or Tilden, [tɪldɨn], 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 is managed by the East Bay Regional Park District, created from the first land the District purchased in 1936. Tilden Regional Park was named in honor of Charles Lee Tilden, a Bay Area attorney and businessman who served on the first Board of Directors of the East Bay Regional Park District.

Orinda station is a Bay Area Rapid Transit station in Orinda, California. The station has an island platform in the center median of State Route 24. Service at the station began on May 21, 1973, following the completion of the Berkeley Hills Tunnel, which connects it to Rockridge station. An abstract mural by Win Ng, partially covered by advertisements, is located in the fare lobby.In 2008, BART added solar panels over parking areas at Orinda station, as well as the Richmond and Hayward maintenance yards. The $3.8 million project was expected to provide all station electrical needs during daylight hours.The elevator to the platform is outside of the paid area. BART plans to add a dedicated faregate for the elevator in 2022.