Le Pate is a 250-hectare hexagonal section on the western side of Pie Island in Lake Superior. On Pie Island, greywackes and a layer of shale underlie a colossal circular mesa with caprock some 90 metres thick. Of volcanic origin, the mesa consists of dark, coarse, durable rock that helps protect the underlying sedimentary rock from erosion. There are no facilities in this nature reserve. Visitors are advised to beware of falling rocks, and are requested to respect the fragility of the area's unusual natural features.