Lake Mealup Preservation Society Inc. is the owner of Lake Mealup, a property consisting of three blocks which include part of the lake and adjacent bushland which is located approximately 20km west of Pinjarra and 2km east of the Peel-Harvey Estuary, Western Australia. The main aim of the Lake Mealup Preservation Society is environmental preservation, to which end a weir has been constructed at the lake to enable the water level to be controlled. There are additionally ongoing flora and fauna surveys as well as hydrology monitoring.
The sanctuary covers 123.69 hectares and consists of three blocks containing a variety of swan coastal plain habitats. Vegetation consists of mixed jarrah (Eucalyptus marginata), marri (Corymbia calophylla), tuart (Eucalyptus gomphocephala) and banksia woodland , with melaleuca and flooded gum (Eucalyptus rudis) flats, large reed beds and extensive areas of open water. Over 100 species of native flowers have been identified, and an extensive fauna list boasts more than 120 bird species and 19 reptiles, as well as western grey kangaroos (Macropus fuliginosus) and southern brown bandicoots (Isoodon obesulus), known as quenda in the local Noongar tongue.