Three Mile Pond Wildlife Management Area (WMA) contains a variety of habitats at the center of which is the 165-acre Three Mile Pond. North of the pond is an extensive beaver-impounded marsh. The portions north and west of Brush Hill Road are completely forested and primarily comprised of northern hardwoods and dominated by mature red oak and sugar maple. South of the pond are mixed-age northern hardwoods and old-field white pines. Along Cross Road and Brush Hill Road are remnant agricultural fields which are now a mix of shrubland and grassland habitats.

The WMA is located in the northeast corner of Sheffield. Primary access is from three small grass parking lots located on the south side of Cross Road, the east side of Home Road, and the west side of Brush Hill Road. Off Brush Hill Road, across from the parking lot, there is informal car-top boat access to Three Mile Pond.

Threemile Pond is an uncommon type of pond for Massachusetts because it has mineral-rich, calcareous bedrock