San Antonio Reservoir

Rancho Valle de San José (also called "Valle de San José y Corralitos") was a 48,436-acre (196.01 km2) Mexican land grant in present-day Alameda County, California. It was made up of the former pasture land belonging to Mission San José. It was given in 1839 by Governor Juan Alvarado to Antonio Maria Pico, Agustín Bernal (1797–1872), Juan Pablo Bernal (1810–1878), and Antonio Suñol (in conjunction with his wife María Dolores Bernal de Suñol). The grant encompassed present-day Sunol and Pleasanton.

The Vallecitos Nuclear Center is a nuclear research facility, and the site of a former GE Hitachi Nuclear Energy electricity-generating nuclear power plant in unincorporated Alameda County, California, United States. The facility is approximately 30 miles (48 km) east of San Francisco, under jurisdiction of the US Nuclear Regulatory Commission's Region IV.The Vallecitos boiling water reactor (VBWR) was the first privately owned and operated nuclear power plant to deliver significant quantities of electricity to a public utility grid. During the period October 1957 to December 1963, it delivered approximately 40,000 megawatt-hours of electricity. This reactor—a light-water moderated and cooled, enriched uranium reactor using stainless steel-clad, plate-type fuel—was a pilot plant and test bed for fuel, core components, controls, and personnel training for the Dresden Nuclear Power Plant, a Commonwealth Edison station built in Illinois five years later. The plant was originally a collaborative effort of General Electric and Pacific Gas and Electric Company, with Bechtel Corporation serving as engineering contractor. Samuel Untermyer II, the General Electric engineer responsible for the initial design of the VBWR, had performed much of the conceptual research at Argonne National Laboratory while conducting heat transfer and nuclear physics experiments, including the BORAX experiments. Vallecitos Power Plant held the US Atomic Energy Commission's "Power Reactor License No. 1". The main power generating facilities closed in 1963. The discovery of an active fault running beneath the facility led to the closure of its most productive reactors in 1977.The Vallecitos site includes the Radioactive Materials Laboratory where post-irradiation examinations were carried out. A small 100-kilowatt research reactor called the "Nuclear Test Reactor" (NTR, NRC License R-33) was the last operational reactor at the site. It utilized U-AL alloy fuel, and was used for nondestructive material imaging. Vallecitos also fabricated radioactive source materials used in medicine and industry, under a license issued by the State of California. In May 2023,GE Hitachi announced the cessation of operations at the Vallecitos Nuclear Center with the intent of transferring ownership of the site to NorthStar Group Services for overall decommissioning.

Scotts Corner (formerly, Scott's Corner) is an unincorporated community in Alameda County, California. It is 1 mile (1.6 km) east-southeast of Sunol, at an elevation of 259 feet (79 m). The name is in honor of Thomas Scott, Sr., who opened a store here in the 1850s.

The Sunol Water Temple is located at 505 Paloma Way in Sunol, California. Designed by Willis Polk, the 59 foot high classical pavilion is made up of twelve concrete Corinthian columns and a concrete ring girder that supports the conical wood and tile roof. Inside the temple, water originally from the Pleasanton well fields and Arroyo de la Laguna flowed into a white tiled cistern before plunging into a deeper water channel carrying water from the filter galleries to the Niles Aqueduct in Niles Canyon and across San Francisco Bay near the Dumbarton Bridge. The ceiling of the temple has panels with paintings by Yun Gee and other artists depicting a Native American maiden carrying water vessels, and women in classical poses. The temple is open to the public Monday to Friday, 9 a.m. to 3 p.m.

Sunol Valley (Spanish: Valle de Suñol) is located in Alameda County, California, United States. The small town of Sunol lies in the valley. It is largely rural, but is in proximity to the highly populated Bay Area suburbs of Fremont, Pleasanton, and Livermore.

Sunol (Spanish: Suñol) is an unincorporated area and census-designated place in Alameda County, California. Located in the Sunol Valley of the East Bay, the population was 913 at the 2010 census. It is best known as the location of the Sunol Water Temple and for its historic tourist railroad system, the Niles Canyon Railway.

The Niles Canyon Railway (NCRy) is a heritage railway running on the first transcontinental railroad alignment (1866, 1869) through Niles Canyon, between Sunol and the Niles district of Fremont in the East Bay of the San Francisco Bay Area, in California, United States. The railway is listed on the National Register of Historic Places as the Niles Canyon Transcontinental Railroad Historic District. The railroad is operated and maintained by the Pacific Locomotive Association which preserves, restores and operates historic railroad equipment. The NCRy features public excursions with both steam and diesel locomotives along a well-preserved portion of the first transcontinental railroad.

Arroyo de la Laguna is a 7.5-mile-long (12.1 km) southward-flowing stream in Alameda County, California, United States which originates at the confluences of South San Ramon Creek and Arroyo Mocho. The Arroyo de la Laguna is fed by tributaries in the Amador Valley and certain eastern slope drainages of the Diablo Range; these tributaries include Arroyo Valle and Sinbad Creek. Arroyo del la Laguna is the major tributary to Alameda Creek which in turn flows into the San Francisco Bay. From prehistoric times much of the eastern part of the Amador Valley consisted of a lake known as Tulare Lake. With development of the valley starting in the 19th century, drainage alterations in this watershed reduced the lake to a watercourse now called the Arroyo de la Laguna.

Ridgelands Regional Park is a future regional park to be developed in Pleasanton, CA by the East Bay Regional Park District. The concept is expected to be developed over many years; the core has already been put in place as the Pleasanton Ridge Regional Park, a 5,200-acre (21 km2) park west of Pleasanton and north of Sunol, that overlooks Pleasanton and the Livermore Valley from the west.

Pleasanton Ridge Regional Park is a 5,271-acre (21.33 km2) park in the East Bay Regional Park District overlooking Pleasanton, California and the Livermore Valley to the east. The park is scheduled to grow by almost 1,500 acres (6.1 km2) (sic) with the acquisition of the Tyler Ranch.

Verona is an unincorporated community in Alameda County, California. It is located on the Western Pacific and the Southern Pacific Railroads 2.25 miles (3.6 km) north of Sunol, at an elevation of 315 feet (96 m).

The Sunol Regional Wilderness is a regional park in Alameda County, the eastern San Francisco Bay Area, Northern California. It is located near the town of Sunol, south of Pleasanton and east of Fremont. The 27.74 square kilometres (6,850 acres) park was established in 1962, and is administered by the East Bay Regional Park District. The park is subject to either closure or fire restriction during the wildfire season from June through October.