Warren National Park, Nature reserve in Shire of Manjimup, Australia.

Warren National Park is a nature reserve spanning roughly 3000 hectares in the Shire of Manjimup with thick forest throughout. The landscape centers on karri trees, which grow into some of the tallest hardwoods found anywhere, creating a dense canopy above the forest floor.

Warren National Park covers 31 km² of old-growth karri forest in the South West region. In the 1930s and 1940s, some of the tall karri trees were fitted with wooden platforms and used as fire lookout towers to spot bushfires in the dry season. The 65 m Dave Evans Bicentennial Tree was pegged in 1988 for Australia's bicentennial celebrations and is now open to climbers.

The park lies within the traditional country of the Bibbulmun and Minang Noongar groups, though the sources consulted record no specific Noongar sites or stories inside it. What visitors can see today is the mark of 1930s and 1940s forestry: the Dave Evans Bicentennial Tree, pegged in 1988 for Australia's bicentenary, was first used as a fire lookout, and walkers still climb its 65 m trunk by steel pegs.

The park features multiple walking trails through the forest that suit different fitness levels and interests. Fishing opportunities exist in the Warren River, but visitors should check local guidelines before planning their visit.

One of the park's karri trees has been made climbable, allowing visitors to ascend high into the canopy and see the forest from above. This rare experience shows just how tall these giants grow and offers a completely different perspective on the landscape.