Ballona Creek is an waterway in southwestern Los Angeles County, California, whose watershed drains the Los Angeles basin, from the Santa Monica Mountains on the north, the Harbor Freeway (I-110) on the east, and the Baldwin Hills on the south. It heads in the historical Rancho Las Cienegas and flows through Culver City and the Del Rey district before emptying into Santa Monica Bay between Marina del Rey and the Playa del Rey district.