D'Entrecasteaux National Park is a national park in Western Australia (Australia), 315 kilometres (196 mi) south of Perth. The park is named after the French Admiral Bruni D'Entrecasteaux who was the first European to sight the area and name Point D'Entrecasteaux in 1792.
The park stretches 130 km (81 mi) from Black Point in the west to Long Point in the east and extends inland as far as 20 km (12 mi). Black Point is made of basalt columns from a lava flow that occurred 135 million years ago. An interesting feature in the park is Yeagarup dune, a mobile 10-kilometre (6.2 mi) long sand dune found to the west of Lake Jasper.