Pine Tree Gulch

Rancho San Gregorio was a 17,783-acre (71.97 km2) Mexican land grant in present day San Mateo County, California given in 1839 by Governor Juan Alvarado to Antonio Buelna. At the time, the grant was in Santa Cruz County; an 1868 boundary adjustment gave the land to San Mateo County. The rancho extended from Tunitas Creek in the north to the mouth of Pomponio Creek and encompassed San Gregorio, California, San Gregorio State Beach and La Honda

El Corte de Madera Creek (Spanish for: The Cutting of Wood) is a small river in the Santa Cruz Mountains, San Mateo County, northern California. It is a tributary of San Gregorio Creek. The creek flows about 7 miles (11 km), from its source in Kings Mountain (37°24′44″N 122°18′40″W) near Skeggs Point on Skyline Boulevard (CA 35), to its confluence with San Gregorio Creek about 2.7 miles east of San Gregorio. The bulk of El Corte de Madera Creek's upper watershed is in El Corte de Madera Creek Open Space Preserve of the Midpeninsula Regional Open Space District, which features popular hiking and mountain biking trails.

Clear Creek is a small river in San Mateo County, California and is a tributary of San Gregorio Creek.

Bogess Creek is a small river in San Mateo County, California and is a tributary of San Gregorio Creek.

Bellvale is a populated place in San Mateo County, located at 37°18′43″N 122°19′12″W. The small community is on Highway 84 (La Honda Road) between San Gregorio and La Honda, at 240 feet above sea level.Bellvale was named for the Bell family, who settled in the area in the mid-nineteenth century. James Bell paid for construction of a schoolhouse in 1869, which served children from nearby La Honda. Although Bellvale once had a post office, the community is now only sparsely settled with homes and farms. The Bellvale post office, located 2.25 miles west of La Honda, opened in 1897 and was discontinued in 1922. U.S. Geological Survey maps show oil wells in the area, tapping a relatively small pool of petroleum that was first identified in the nineteenth century.

Kingston Creek is a small river in San Mateo County, California and is a tributary of San Gregorio Creek. The average flow rate of this river is 60 US gallons per minute (0.0038 m3/s), as measured midway through the path of the river. The river is pumped for Irragation. Some crayfish live in the river.

The La Honda Creek Open Space Preserve is a publicly accessible 6,142-acre open space reserve in San Mateo County, California, part of the Midpeninsula Regional Open Space District. It opened to the public in November 2017. The preserve was established in 1984. It was for years the largest of the open space preserve in the county not open to the public.

Harrington Creek is a small river in San Mateo County, California and is a tributary of San Gregorio Creek.

East Fork Tunitas Creek is a small river in San Mateo County, California and is a tributary of Tunitas Creek.The Tunitas Creek Association (TCA) is a conservation organization was founded in 2004. The current secretary, Pliny Keep, lives on the East Fork of Tunitas Creek. Tunitas Creek was last surveyed by the California Department of Fish and Game in 1967 and found to contain wild steelhead trout. We have seen smolts every year in the main fork, but the East Fork goes underground in sections during dry years.

Rings Gulch is a valley in San Mateo County, California. It contains a stream which is a tributary of Tunitas Creek.

Rancho Cañada de Verde y Arroyo de la Purísima was a 8,906-acre (36.04 km2) Mexican land grant in present-day San Mateo County, California given in 1838 by Governor Juan B. Alvarado to José María Alviso. The name roughly translates to ranch of the green glen and brook of the Purest (as in Immaculate Conception of the Virgin Mary). The grant extended along the Pacific coast from Purisima Creek south to Tunitas Creek and encompasses present-day Lobitos and the ghost town Purissima.