Rancho Pauba was a 26,598-acre (107.64 km2) Mexican land grant in present-day Riverside County, California given in 1844 by Governor Manuel Micheltorena to Vicente Moraga and Luis Arenas. The grant was just east of present-day Temecula. At the time of the US patent, Rancho Pauba was a part of San Diego County. Riverside County was created by the California Legislature in 1893 by taking land from both San Bernardino and San Diego Counties.