Central Canadian Shield forests
This ecoregion consists of rolling hills, lakes, bogs and rocky outcrops covering a large curved swathe on the Canadian Shield from eastern Manitoba and Northern Ontario running southeastwards through Thunder Bay District to the north shore of Lake Superior and then northeastwards into western Quebec. The area has a cool climate with summer temperatures averaging around 13°C dropping to a very cold -17°C in winter, with the hills around Lac Seul in northwestern Ontario being warmer and wetter than most of the area. Average rainfall in the eastern side of the ecoregion is 550mm per year, rising to 750mm in the centre (near Lake Nipigon for example), up to 900mm in the west. Specific areas include Lake Nipigon and Big Trout Lake (Ontario). These forest contrast with more severe boreal forest ecoregions such as the Eastern Canadian Shield taiga to the north, which covers most of Northern Quebec and Labrador.
Fort Lewis
Fort Lewis' terrain is primarily a mixture of dense conifer woods and open Puget prairie-garry oak woodlands. Invasive Scotch Broom has taken over many areas. The landscape is very rocky from glacial meltwater deposits. Poison oak is found in the training areas. Canada Thistle grows thickly in some areas. All trees are to be left standing; post policy prohibits cutting or trimming them.