The Manly Dam Reserve, also known as the Manly Warringah War Memorial Park, is an urban bushland reserve located in the Northern Beaches region of Sydney, Australia. The reserve adjoins the south-eastern edge of Garigal National Park. Located within the 376 hectares (930 acres) reserve is the 30-hectare (74-acre) dam reservoir. The heritage listed dam wall was designed and built in 1892 by the NSW Department of Public Works. The dam wall is located just outside the boundary of the reserve and is owned by Sydney Water. There are a number of Aboriginal heritage sites in the reserve.