The 535-sq-km Shannon National Park is on the South Western Hwy, 53km south of Manjimup. Until 1968 Shannon was the site of WA's biggest timber mill.
The 48km Great Forest Trees Drive is a one-way loop, split by the highway. Start at the park day-use area on the north of the highway. From here there's an easy 3.5km walk to the Shannon Dam and a steeper 5.5km loop to Mokare's Rock, with a boardwalk and great views.
Further along, the 8km (return) Great Forest Trees Walk crosses the Shannon River. Off the southern part of the drive, boardwalks look over stands of giant karri at Snake Gully and Big Tree Grove .
In the park's southwest, a 6km (return) walking track links Boorara Tree with a lookout point over Lane Poole Falls.
There is a sizeable campground with showers in the spot where the original timber-milling town used to be. A self-contained bunkhouse, Shannon Lodge , is available for groups of up to eight people; book this through Parks & Wildlife in Pemberton.
