Buckland Hill Reservoir is situated in Mosman Park, Western Australia. The covered reservoir is the most westerly in the Perth metropolitan area and provides sweeping views across Gage Roads of Rottnest Island, Garden Island and the Port of Fremantle and mouth of the Swan River to the west and Lucky Bay and Bicton and East Fremantle to the east. The reservoir was originally filled with water from Perth's hill dams and features a water treatment plant. Most of Perth's water supply is now sourced from groundwater aquifers in the Swan Valley.