The Hacking River originates in the Royal National Park south of Sydney, in the Sutherland Shire, and flows into the Port Hacking Estuary. The estuary extends from the tidal reach at Audley Weir to the heads at Cronulla and Bundeena, offering a substantial paddling corridor through varied landscapes. The northern side of the estuary opens into suburban bays, while the southern shore borders the Royal National Park, where several creeks provide access into the park's interior.

A common put-in is at Reids Flat Picnic Area, located in the Royal National Park a few hundred metres from Audley Weir at the end of Riverside Drive. Car access is available here, though a National Parks entry charge applies. The water at this end of the estuary is sheltered and generally calm except after significant rainfall, making it a practical location for skill practice as well as the starting point for longer paddles toward Bundeena and the heads. The full estuary paddle from Audley to Bundeena covers approximately 12 kilometres one way.

South West Arm Creek, accessible from boat ramps on the northern side of Port Hacking opposite Lilli Pilli, runs into the Royal National Park for around 3.5 kilometres. This creek is best paddled around high tide, as shallow water can make it impassable at other times. Mangroves are present along portions of the estuary and are accessible at high tide.

Tidal planning is relevant for the full estuary route; paddlers aiming for longer trips are advised to time their journey so tides are favourable. The estuary passes through varied terrain including mangroves, open water, and coastal scenery, with wildlife and flora characteristic of the Royal National Park. The Bonnie Vale campground near Bundeena provides a rest point along the route.

Multiple boat ramps on the northern side of Port Hacking offer additional launch options for those wanting to access different sections of the estuary or side creeks.