Where did Fremont cross the Tehachapi Mountains?

The Coachella Valley is an irrigated agricultural and recreational desert valley in southern California east of Los Angeles. The valley extends for approximately 45 miles (72 km) in Riverside County southeast from the San Bernardino Mountains to the Salton Sea. It is approximately 15 miles (24 km) wide along most of its length, bounded on the west by the San Jacinto Mountains and the Santa Rosa Mountains and on the north and east by the Little San Bernardino Mountains. The San Andreas Fault crosses the valley from the Chocolate Mountains in the southeast corner and along the centerline of the Little San Bernardinos. The fault is easily visible along its northern length as a strip of greenery against an otherwise bare mountain. The Chocolate Mountains are home to a United States Navy live gunnery range and are mostly off-limits to the public. In comparison to the "Inland Empire" (Riverside-San Bernardino, etc.), some people reference Coachella Valley as the "Desert Empire".