Ontario is divided into four regions, including the Canadian Shield, Hudson Bay Lowlands, Great Lakes Lowlands and St. Lawrence Lowlands.

The Canadain shield covers about two-thirds of Ontario. It's a simple landscape of flat plateaus and low, rounded hills, crisscrossed by rivers and lakes.

There are no mountainous landscapes in Ontario. The average elevation in the Canadian Shield region averages near 305 m (1000 ft). A few elevated areas (high hills and ridges) do reach above 660 m (2165 ft) to the north of Sault Ste. Marie. The same is true northeast of Sudbury where Ontario's highest point stands; Ishpatina Ridge, 693 m (2,274 ft.).

The Canadian Shield slopes gently to the north, where it flattens out into the rocky Hudson Bay Lowlands, land covered by bogs and swampy forests.

More information: https://www.worldatlas.com/webimage/countrys/namerica/province/onzland.htm