Sandbar Lake, the largest of 10 lakes within the park's bounds, has a fine sandy beach -- courtesy of a postglacial outwash plain. Over many, many years, much of the deposited material has eroded away, leaving the beach long and narrow.

Erratic boulders are strewn amidst the trees and an esker winds southwest of the park. These are remnants of the days when the region was inhabited by ice. The remains of log dwellings from the late 1800s and other artifacts are evidence of the more recent past.

The forest is the transitional zone, with boreal species as well as those of the Great Lakes-St. Lawrence Lowlands.
Tall bulrushes line the banks of rivers and creeks, and bluebead lily, red bunchberry, wild blueberries, club moss, and various orchids grow on the forest floor.

Lynx are sometimes observed here. Other large animals include moose, white-tailed deer, beaver, otter, and the painted turtle. The park has become associated with the spotted sandpiper, which may be seen darting across the beach. Other birds seen in the park include the loon, grouse, Canada jay, red-winged blackbird and various types of woodpeckers.