Rancho Piedra Blanca was a large, 48,806-acre (197.51 km2) Mexican land grant in present-day San Luis Obispo County, California given in 1840 by Governor Juan Alvarado to José de Jesús Pico.[1] The name means "white rock" and refers to rocks painted white by its bird population. The grant extended south along the Pacific Coast below Big Sur from Ragged Point to Pico Creek (formerly Arroyo del Pinal), where it adjoins Rancho San Simeon.[2] The land grant includes the original townsite and post office for San Simeon, the Hearst Ranch headquarters, and Hearst Castle.