Lake Arrowhead and Big Bear Lake, two local winter destinations to enjoy when summer is too hot in the Valleys

The west border of the San Bernardino  forest adjoins Angeles National Forest and runs north-south about ten miles west of Interstate 15. At its widest parts, the northern portion of the forest runs about 57 miles (90 km) on an east–west dimension. It runs about 24 miles (40 km) on a north–south dimension. This portion of the forest encompasses the San Bernardino Mountains. The area extends west of Mount San Antonio, and Wrightwood in San Bernardino County. The eastern portion of the forest extends about ten miles east of Big Bear City and includes the San Gorgonio Wilderness.

The southernmost portion is bisected by the Riverside County line and borders the Morongo Indian Reservation north of Cabazon. At its widest point, the southern portion is about 27 miles (40 km) on a north-south dimension and about 30 miles (50 km) on an east-west dimension. Toro Peak and the Santa Rosa Indian Reservation are near the south extent. At the north is Snow Creek Village and the Morongo Indian Reservation. Mount San Jacinto State Wilderness is carved out of the southern portion.

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