The region was named for San Benancio Gulch which is the small canyon that forms the majority of the region. A map dated 1834 lists the region as "Canada de San Benancio". The
Spanish name most likely refers to one of four
saints venerated with the name
Venantius. San Benancio was the inspiration for "Las Pasturas del Cielo," the fictional setting in
John Steinbeck’s
Pastures of Heaven. A Salinas native, Steinbeck spent time in his youth within San Benancio, specifically Castle Rock near the base of the Canyon, and accurately described the region in
Pastures of Heaven: ==Geography and climate==