Rancho El Cajón was a 48,800-acre (197 km2) Mexican land grant in present day San Diego County, California given in 1845 by Governor Pio Pico to María Antonia Estudillo de Pedrorena.[1] The name means "the box" in Spanish, and refers to the valley between hills. The grant encompassed present day El Cajon, Bostonia, Santee, Lakeside, Flinn Springs, and the eastern part of La Mesa.[2] The grant contained the 28-acre (0.11 km2) Rancho Cañada de los Coches grant.