[1][2][3][4] It is in the Saint Lawrence River drainage basin, and flows from its source at Larder Lake in geographic McFadden Township to its mouth as a left tributary of the Blanche River in the municipal township of Evanturel.

The Larder River has many wild rapids, making it suitable for experienced whitewater canoeists.

[5] The river begins at the mouth of the Larder Lake (length: 15.6 kilometres (9.7 mi) altitude: 274 metres (899 ft)) in Rattray geographic township in the Timiskaming District.

The Larder River inside the park is characterized by scenic boreal forest, cliffs, outcrops, and plateaus.

[9] The park provides important feeding and calving habitats for moose and nesting sites for birds of prey.