WEST OF THE WESTSIDE -- THE SANTA MONICA MOUNTAINS
The Santa Monica Mountains are a traverse mountain range that stretches from the Pacific Ocean 64 kilometers east to the flood plain where the LA River is fed by the Verdugo Wash. The southern side of the eastern end of the range is almost always referred to as the Hollywood Hills. The central portion lies within LA's westside and the foothills are home to some of LA's most affluent neighborhoods (e.g. Bel Air, Beverly Hills and Pacific Palisades). To the north, separated by the mountains, is the San Fernando Valley. Technically, the Channel Islands are also part of the range, although they're separated from the mainland by water.
Pendersleigh & Sons' Official Map of the Santa Monica Mountains
The western portion of the Santa Monica Mountains separates the Conejo Valley from Malibu and the neighboring communities that make up the Los Angeles district known as the Santa Monica Mountains area. The district borders Ventura County to the west and north, the San Fernando Valley to the northeast and the Westside to the east.