Rancho San Carlos de Jonata

Rancho San Carlos de Jonata was a 26,634-acre (107.78 km2) Mexican land grant in present-day Santa Barbara County, California given in 1845 by Governor Pío Pico to Joaquín Carrillo and Jose Maria Covarrubias.

José María Covarrubias (c. 1809 – 1870), a Frenchman who became a Mexican citizen and came to California in 1834 with the Hijar-Padres Colony to be a schoolteacher.

Covarrubias held several key government posts in Monterey and Santa Barbara.

In 1850, Covarrubias bought the Island of Santa Catalina land grant from Thomas M. Robbins.

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.