Lake Jasper is a rural locality of the Shire of Nannup in the South West region of Western Australia.

A large part of the locality is taken up by the D'Entrecasteaux National Park; its south-eastern border runs along the Donnelly River.

[7] The heritage listed Black Point on the Southern Ocean coast is located with the locality of Lake Jasper, an outcrop of the Bunbury Basalt, which is rarely exposed.

It is an important scientific research site,[8] and dates back to 135 million years ago, when it was formed by a volcanic lava flow.

[11] Roads in the coastal region, especially within the national park, are still often four-wheel drive only and closed in winter because of rain.