San Mateo County, officially the County of San Mateo, is a county located in the U.S. state of California. As of the 2020 census, the population was 764,442. Redwood City is the county seat, and the third most populated city following Daly City and San Mateo. San Mateo County is included in the San Francisco–Oakland–Berkeley, CA MSA, Silicon Valley, and is part of the San Francisco Bay Area, the nine counties bordering San Francisco Bay. It covers most of the San Francisco Peninsula. San Francisco International Airport is located in the northeastern area of the county and is approximately 7 miles (11 km) south of the city and county limits of San Francisco, even though the airport itself is assigned a San Francisco postal address. The county's built-up areas are mostly suburban, and are home to many corporate campuses.
Pacifica is a city in San Mateo County, California, on the coast of the Pacific Ocean between San Francisco and Half Moon Bay.
Gaspar de Portolá y Rovira was a Spanish military officer, best known for leading the Portolá expedition into California and for serving as the first Governor of the Californias. His expedition laid the foundations of important Californian cities like San Diego and Monterey, and bestowed names to geographic features throughout California, many of which are still in use.
The Salinas River is the longest river of the Central Coast region of California, running 175 miles (282 km) and draining 4,160 square miles (10,800 km2). It flows north-northwest and drains the Salinas Valley that slices through the central California Coast Ranges south of Monterey Bay. The river begins in southern San Luis Obispo County, originating in the Los Machos Hills of the Los Padres National Forest. From there, the river flows north into Monterey County, eventually making its way to connect with the Monterey Bay, part of the Pacific Ocean, approximately 5 miles (8.0 km) south of Moss Landing. The river is a wildlife corridor, and provides the principal source of water from its reservoirs and tributaries for the farms and vineyards of the valley.
Devil's Slide is a coastal promontory in California, United States. It lies on the San Mateo County coast between Pacifica and Montara. Its name comes from the rocky edges prone to accident.
San Bruno Mountain is a fault-block horst in northern San Mateo County, California; its northern slopes rise in San Francisco. It is surrounded by San Francisco Bay and the cities of Brisbane, Colma, Daly City, and South San Francisco, and has played an important role in the history of all these communities.
Crystal Springs Reservoir is a pair of artificial lakes located in the northern Santa Cruz Mountains of San Mateo County, California, situated in the rift valley created by the San Andreas Fault just to the west of the cities of San Mateo and Hillsborough, and I-280. The lakes are part of the San Mateo Creek watershed. Crystal Springs Regional Trail runs along the reservoir.
Montara State Beach is a beach located in the coastal region of the U.S. state of California, eight miles north of Half Moon Bay on State Route 1. It is operated by the California State Department of Parks and Recreation under the San Mateo Coast Sector Office. It is one of the cleanest beaches in the state and is known for surfing and fishing.
The Sánchez Adobe Park, home to the Sánchez Adobe, is located in Pacifica, California, at 1000 Linda Mar Boulevard, on the north bank of San Pedro Creek, approximately 0.91 miles (1,470 m) from the Pacific Ocean in Linda Mar Valley. The 5.46-acre (2.21 ha) county park, established in 1947 contains the Sanchez Adobe Historical site, designated a National Register Historical District in 1976 and is California registered landmark 391.
Pedro Mountain Road describes a series of historical road crossings of Pedro Mountain, a promontory ridge located between Montara Mountain and the coastal cliffs of Devil's Slide in San Mateo County, California. This Pedro Mountain headland blocks the easy passage of coastal travelers between the Pedro Valley in Pacifica, California and Montara, California. The most prominent of these Pedro Mountain roads was Coastside Boulevard, the 1914 to 1937 coastal highway 57, which remains in use today as part of the trail network of McNee Ranch State Park.
San Mateo Creek is a perennial stream whose watershed includes Crystal Springs Reservoir, for which it is the only natural outlet after passing Crystal Springs Dam.
San Pedro Creek is a perennial stream in the City of Pacifica, San Mateo County, California, in the San Francisco Bay Area whose tributaries originate on Sweeney Ridge in the Golden Gate National Recreation Area and Montara Mountain in the Santa Cruz Mountains.The creek mainstem flows 2.5 miles (4.0 km) through the San Pedro Valley to its mouth near Shelter Cove of the Pacific Ocean The stream is notable as the 1769 campsite for Gaspar de Portolà before he ascended Sweeney Ridge and discovered San Francisco Bay.
Tunitas Creek is a 6.6-mile-long (10.6 km) stream in San Mateo County, California. Tunitas is Spanish for "little prickly pears".
San Gregorio Creek is a river in San Mateo County, California. Its tributaries originate on the western ridges of the Santa Cruz Mountains whence it courses southwest through steep forested canyons. The San Gregorio Creek mainstem begins at the confluence of Alpine and La Honda Creeks, whence it flows 12 miles (19 km) through rolling grasslands and pasturelands until it meets the Pacific Ocean at San Gregorio State Beach. It traverses the small unincorporated communities of La Honda, San Gregorio, Redwood Terrace and Sky Londa.
San Pedro Valley County Park is a San Mateo County park located in Pacifica, California, which includes the headwaters of San Pedro Creek.
Corte Madera Creek is a 7.3-mile-long (11.7 km) creek that flows north-northwest to Searsville Dam and then joins with Bear Creek to form San Francisquito Creek in California.
San Lorenzo Creek is a 10.7-mile-long (17.2 km) year-round natural stream flowing through Hayward, California and other neighboring unincorporated communities into San Francisco Bay at the Hayward Regional Shoreline.
Laguna Creek is a perennial stream that flows northwesterly for 2.6 miles (4.2 km) along the San Andreas Fault from Woodside in San Mateo County, California and, after crossing the Phleger Estate and Filoli, enters Upper Crystal Springs Reservoir, where it is a historic tributary to San Mateo Creek. San Mateo Creek then carries its waters over Crystal Springs Dam northeast to San Francisco Bay.
This timeline of the Portolá expedition tracks the progress during 1769 and 1770 of the first European exploration-by-land of north-western coastal areas in what became Las Californias, a province of Spanish colonial New Spain. Later, the region was administratively-split into Baja and Alta. The first section of the march was on the Baja California peninsula, and the northern section of the expedition's trail was in today's US state of California.
The Devil's Slide Trail is a hiking trail between Pacifica, California, and Montara, California, in the San Francisco Bay Area. The trail is a segment in the California Coastal Trail, which stretches from Oregon to Mexico.
