Panoche Valley is a grassland valley lying between the Diablo Range and the San Joaquin Valley, in San Benito County, California. The valley is bound on the north by Panoche Hills, on the east by Tumey Hills, on the south by the Griswold Hills and Cerro Bonito, and on the in west by Las Aguilas Mountains. The valley is known by naturalists as a hot spot for rare birds and mammals, and for providing a glimpse of old California.