The city lies in the San Bernardino foothills and the eastern portion of the San Bernardino Valley, roughly east of Los Angeles. Some major geographical features of the city include the San Bernardino Mountains and the San Bernardino National Forest, in which the city's northernmost neighborhood, Arrowhead Springs, is located; the Cajon Pass adjacent to the northwest border; City Creek, Lytle Creek, San Timoteo Creek, Twin Creek, Warm Creek (as modified through flood control channels) feed the Santa Ana River, which forms part of the city's southern border south of San Bernardino International Airport.