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.
Geography of Oklahoma
Forests cover 24 percent of Oklahoma, and prairie grasslands, composed of shortgrass, mixed-grass, and tallgrass prairie, harbor expansive ecosystems in the state's central and western portions. Where rainfall is sparse in the western regions of the state, shortgrass prairie and shrublands are the most prominent ecosystems, though pinyon pines, junipers, and ponderosa pines grow near rivers and creek beds in the far western reaches of the panhandle. Marshlands, cypress forests and mixtures of shortleaf pine, loblolly pine, sabal minor, and deciduous forests dominate the state's southeastern quarter, while mixtures of largely post oak, elm, cedar and pine forests cover the Ozark Mountains in northeastern Oklahoma. Many rare, relic species such as sugar maple, bigtooth maple, southern live oak, and nolina inhabit Southwestern Oklahoma and the Wichita Mountains.