The park takes in the Walpole and Nornalup Inlets and the tidal parts of the Frankland, Deep and Walpole rivers which feed in to the estuary system.
Walpole Inlet is shallow (at most one-metre-deep) while Nornalup Inlet is larger and deeper (up to five metres). The estuaries are joined by a natural one-kilometre long and two-metre deep channel, bordered by steep granite hills and rocky shores. These are known locally as ‘The Knolls’ and are clothed with dense karri, marri and tingle forest.
A major attraction of the inlet system is its remote wilderness feel, particularly in parts of the Nornalup Inlet and the Frankland and Deep rivers.
Picnic tables and barbecues are provided along the shores of the marine park at Coalmine Beach picnic area, The Channels and Sandy Beach. There is a lookout at The Knolls and the Bibbulmun Track abuts the edge of the marine park for a short distance.
The marine park has not been fished commercially since the 1920s and supports excellent recreational fishing opportunities. Make sure you first check the latest size, season and bag limits (www.fish.wa.gov.au) and obtain any licences that may be needed.
There is good access by car or foot to various beauty spots, swimming areas, and shore fishing locations in the park and privately operated ecocruises run every day except August and Christmas Day.
People use private boats to kayak or fish in the inlets and rivers, with boat ramps at Rest Point, Coalmine Beach, Walpole town jetty and at the end of Isle Road.