A network of sparkling small lakes and majestic forests of coniferous and broad-leafed trees make up the landscape of this park, which is just south of the boundary between northern and southern Ontario. The park is close to the northern limits of the Great Lakes-St. Lawrence lowlands forest region, where red and white pine, maple and yellow birch trees predominate. These are mixed with other species more common in the northern boreal forest region -- such as white birch, poplar and jack pine.

Deer and moose are common in the park area, and smaller mammals such as muskrat, raccoon, mink, fox and beaver can often be spotted. More than 160 species of birds have been identified near Grundy Lake, especially in the marsh areas. Heron nests are found in at least two areas of the park close to the campgrounds.