It ran from San Pedro Bay and the Pueblo de Los Ángeles, over the Transverse Ranges through Tejon Pass and down through the San Emigdio Mountains to the San Joaquin Valley, where it followed a route along the eastern slopes of the Coast Ranges between aguaje (watering places) and arroyos. It passed west out of the valley, over the Diablo Range at Corral Hollow Pass into the Livermore Valley, to end at the Oakland Estuary on the eastern San Francisco Bay.