The eastern end of the long oval basin, called the Valle la Trinidad, forms the upper part of the San Matias Pass, at about 3200 feet.
It descends eastward down Cañon San Matias to 2160 feet where it empties out into the Valle Santa Clara to the east.
[1] The pass is a gap about a quarter of a mile wide with a nearly flat bottom and a gradual descent.
[2] The modern Mexican Federal Highway 3, between Ensenada and its junction on Mexican Federal Highway 5 on the east coast plain of the peninsula, passes through this pass.
This article about a location in the Mexican state of Baja California is a stub.