Lake Burragorang is one of Australia's most significant and strictly protected water bodies, serving as the primary drinking water reservoir for the city of Sydney. Formed by Warragamba Dam — a massive concrete structure standing 142 metres tall and 351 metres long — the lake stretches 52 kilometres in length and encompasses 75 square kilometres of surface area. Nestled within the Blue Mountains region of New South Wales, the lake sits at the heart of a 9,051 square kilometre catchment that receives an average annual rainfall of 840 millimetres. Despite its impressive size and the remarkable fishery it contains, Lake Burragorang is entirely closed to public access and fishing, making it one of the most strictly restricted catchment areas in the world.