Rancho Laguna de los Palos Colorados

Rancho Boca de la Cañada del Pinole was a 13,316-acre (53.89 km2) Mexican land grant in present-day Contra Costa County, California given in 1842 by Governor Juan Alvarado to María Manuela Valencia. The name means "Mouth of the Pinole Valley" in Spanish. The rancho located between present-day Martinez, Pleasant Hill, Orinda, and Lafayette.

Leuschner Observatory, originally called the Students' Observatory, is an observatory jointly operated by the University of California, Berkeley and San Francisco State University. The observatory was built in 1886 on the Berkeley campus. For many years, it was directed by Armin Otto Leuschner, for whom the observatory was renamed in 1951. In 1965, it was relocated to its present home in Lafayette, California, approximately 10 miles (16 km) east of the Berkeley campus. In 2012, the physics and astronomy department of San Francisco State University became a partner. Presently, Leuschner Observatory has two operating telescopes. One is a 30-inch (760 mm) optical telescope, equipped with a CCD for observations in visible light and an infrared detector used for infrared astronomy. The other is a 12-foot (3.7 m) radio dish used for an undergraduate radio astronomy course. The observatory has been used to perform professional astronomy research, such as orbit determination of small solar system bodies in the early 1900s and supernova surveys in the 1980s and 1990s. It has also served as a primary tool in the education of graduate and undergraduate students at UC Berkeley.

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

The Briones Hills form a low mountain range in western Contra Costa County, in the East Bay region of the San Francisco Bay Area, California, United States.

Briones Regional Park is a 6,117-acre (24.75 km2) regional park in the East Bay Regional Park District (EBRPD) system, located in the Briones Hills of central Contra Costa County of the San Francisco Bay Area in 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.

Briones Reservoir is an open cut terminal water storage reservoir located in western Contra Costa County, in the East Bay region of the San Francisco Bay Area, California. It is owned and operated by the East Bay Municipal Utility District (EBMUD).

Lamorinda is an area within Contra Costa County, California in the United States. The name is a portmanteau from the names of the three cities that make up the region: Lafayette, Moraga and Orinda.Lamorinda sits east of the Berkeley Hills between the Caldecott Tunnel and Walnut Creek. It is also referred to as the "Highway 24" corridor, referring to the state highway that is the primary thoroughfare in the region. Many residents commute west through the tunnel to San Francisco and Oakland or east to Walnut Creek and Concord. As of 2010 the three cities had a combined population of 57,552, with Lafayette having the largest population and Moraga the smallest.

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.

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

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.

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.