The Ballona Wetlands Ecological Reserve (BWER) is the last coastal wetland in Los Angeles. It is sandwiched generally between Marina del Rey to the north, Playa Vista to the east, bluffs to the south, and the double dune system to the west, separating it from the Pacific Ocean. The wetlands are bisected by the Ballona Flood Control Channel, which carries rainwater and dry season urban flow from the upper Ballona Creek Watershed through the urban core to the ocean. The BWER is owned and managed by the California Department of Fish and Wildlife (CDFW), a State resource agency.