Gloucester National Park, Nature reserve in Western Australia.

Gloucester National Park is a nature reserve near Pemberton featuring thick karri tree forests with numerous walking paths. The forest canopy dominates the landscape and provides visitors with various routes to explore at their own pace.

The Gloucester Tree was fitted with a lookout platform, cabin and climbing pegs in 1947, one of eight such fire-lookout trees built in the area between 1937 and 1952. It remained in fire observation service until 1952. In 1973 the original wooden cabin was replaced with an aluminium and steel cabin and gallery.

The park and its karri tree are named after the city of Gloucester in England, a name given in 1946; the German sources instead link the tree to the Duke of Gloucester, who visited Pemberton when the platform was built. The tree was one of eight fire-lookout trees erected in the area between 1937 and 1952, and by 1963 more than 3,000 people had climbed it.

The park entrance is about 3 km from Pemberton, reached by road rather than on foot. Picnic tables and toilets are provided at both the Gloucester Tree and the Lefroy Brook waterfall. The climbing pegs on the Gloucester Tree lead to a platform 60 m up, and the tree is one of eight lookout trees built in the area between 1937 and 1952.

The Gloucester Tree is famous for climbing pegs driven into its trunk since 1947, allowing visitors to climb to the height of the forest canopy. The ascent offers an unusual perspective on the forest that you would not otherwise experience.