As of 2016, the aquatic reserve extents seaward for a distance of about 1 kilometers from Gulfview Road in the suburb of Christies Beach in the north with its seaward boundary finishing in the south at the shoreline near the west end of Helmsman Terrace in the suburb of Seaford and includes the full extent of the Onkaparinga River from its mouth to the bridge on the South Road in the suburbs of Noarlunga Downs and Seaford Meadows.