Wapengo Lagoon is a permanently open coastal estuary classified as a lake, covering an area of 3.7 square kilometers on the Sapphire Coast of New South Wales. Its catchment of 68.5 square kilometers is dominated by native forests and grazing lands, contributing to its consistently high water quality, which is regularly monitored and rated as good to excellent. The lagoon is a significant ecological site, supporting saltmarsh and mangrove communities, and is a cornerstone of the local economy through its well-known, organic-certified commercial oyster farming industry. The surrounding landscape includes coastal headlands, beaches, and forested areas, much of which borders Mimosa Rocks National Park, offering a pristine and protected natural setting for anglers.