The San Gabriel Valley is one of the principal valleys of Southern California, lying generally to the east of the city of Los Angeles. Surrounding features include:

• San Gabriel Mountains on the north,
• San Rafael Hills to the west, with Los Angeles Basin beyond; San Fernando Valley and Crescenta Valley farther to the northwest,
• Puente Hills to the south, with the coastal plain of Orange County beyond,
• Chino Hills and San Jose Hills to the east, with the Pomona Valley and Inland Empire beyond.