The headwaters of the urban river known as Ballona Creek are in the Santa Monica Mountains, such as above Beverly Hills and flows along the north base of Baldwin Hills through an active geological watergap, on the way to the Pacific Ocean in Santa Monica Bay. La Cienega Boulevard goes through a pass in the ridge of the Baldwin Hills between Inglewood and Culver City, and northeast of Los Angeles International Airport. La Cienega Boulevard is a parkway road passing alongside open space of large private corporate lands with oil wells of the Inglewood Oil Field in the southern Baldwin Hills.