Rancho San Joaquin
Rancho San Joaquin, the combined Rancho Cienega de las Ranas and Rancho Bolsa de San Joaquin, was a 48,803-acre (197.50 km2) Mexican land grant in present-day Orange County, California given to José Antonio Andres Sepúlveda. In Spanish Cienega de las Ranas means "Marsh of the Frogs" and Bolsa means "Pocket", and usually in reference to wetlands landforms.
Rancho Cienega de las Ranas was granted to José Sepúlveda (1803–1875) by Mexican Alta California Governor Juan Bautista Alvarado in 1837. Rancho Cienega de las Ranas encompassed present-day Irvine and the San Joaquin Hills. Additional land, Rancho La Bolsa de San Joaquín, was granted to Sepúlveda in 1842. Rancho Bolsa de San Joaquin encompassed Newport Bay and estuary in present-day Newport Beach southeast to Laguna Canyon Creek flowing to present-day Laguna Beach. Together these two ranchos formed Rancho San Joaquín.
With the cession of California to the United States following the Mexican-American War, the 1848 Treaty of Guadalupe Hidalgo provided that the land grants would be honored. As required by the Land Act of 1851, a claim for Rancho San Joaquin was filed with the Public Land Commission in 1852, and the grant was patented to José Sepulveda in 1867.
- Hoffman, Ogden (1862). Reports of Land Cases Determined in the United States District Court for the Northern District of California. San Francisco: Numa Hubert.
- U.S. Geological Survey Geographic Names Information System: Rancho San Joaquin
- Diseño del Rancho San Joaquín
- Orange County Spanish and Mexican Ranchos
- Hoover, Mildred B.; Rensch, Hero; Rensch, Ethel; Abeloe, William N. (1966). Historic Spots in California. Stanford University Press. ISBN 978-0-8047-4482-9.
- United States. District Court (California : Southern District) Land Case 185 SD
- Report of the Surveyor General 1844 - 1886