Its most prominent summit, Matterhorn Peak, rises to 2,636 metres (8,648 ft), making it the highest point in the Shuswap Highland.

[4] Though technically part of the Columbia Mountains to the north and east, the Dunn massif is isolated from other ranges by the Interior Plateau and the Shuswap Highland.

[6] The protected area surrounding the peaks contains old-growth forest, including stands of Engelmann spruce and interior Douglas fir.

The park also contains significant wildlife populations, including wolf, cougar, marten, river otter, black bear, mule deer and mountain goat.

Several protected avian species are present, such as the great blue heron and bald eagle.