The Mixedwood Plains consists mostly of gently rolling hills, plains and contains 9% of Canada ’s land. The Mixedwood Plains ecozone extends alongside the Quebec City-Windsor corridor, as well as the densely-populated region of southern Ontario . Prominent physical features break up the gently rolling plains of most of the ecozone. Limestone, shale, and sandstone are traits of the flat-lying St. Lawrence lowlands, while deposits from the ancient water bodies and glaciers make the soil the most productive in Canada . Mount Royal (A mountain in the city of Montreal ) rises to 227 metres above sea level from the flattest and widest sections of the Montreal Plain. The Mixedwood Plains Ecozone includes four of the Great Lakes -- Superior , Huron, Erie , and Ontario -- and the St. Lawrence River from Kingston to Quebec City . These Great Lakes compose of nearly 20% of the world's fresh’s water. This ecozone is famous for there mountains, scenery, rivers and valleys, this is the place to be if you want to get out into nature.