Brown Lake (Bummeria) is a perched lake on North Stradbroke Island, in South-East Queensland, Australia. The ecosystem is an example of a coastal non-floodplain sand lake and is characterised by acidic water, nutrient-poor and sandy soil, shrub-like vegetation and wet heathland. Brown Lake is of geographical significance, possessing ecological value. The geomorphology of the ecosystem is representative of the unique parabolic dune ridge systems that formed during the Pleistocene epoch. As a perched lake, the hydrological operations of Brown Lake are highly diverse and complex.