Most of this region lies in the lee of the Great Lakes, making for abundant snow in some areas.
In December 2010, the snowbelt set a new record when it was hit by more than a metre of snow within 48 hours.
In contrast, the larger, northern part of Ontario is sparsely populated with cold winters and heavy forestation.
The highest point is Ishpatina Ridge at 693 metres (2,274 ft) above sea level in Temagami, Northeastern Ontario.
In the south, elevations of over 500 m (1,640 ft) are surpassed near Collingwood, above the Blue Mountains in the Dundalk Highlands and in hilltops near the Madawaska River in Renfrew County.
A well-known geographic feature is Niagara Falls, part of the Niagara Escarpment.
The Saint Lawrence Seaway allows navigation to and from the Atlantic Ocean as far inland as Thunder Bay in Northwestern Ontario.
Pelee Island and Middle Island in Lake Erie extend slightly farther.
All are south of 42°N – slightly farther south than the northern border of California.
The region has warm to hot, humid summers and cold winters.
Annual precipitation ranges from 750–1,000 mm (30–39 in) and is well distributed throughout the year.
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Ontario is bordered by the province of Manitoba to the west, Hudson Bay and James Bay to the north, and Quebec to the east and northeast, and to the south by the U. states of (from west to east) Minnesota, Michigan, Ohio, Pennsylvania and New York.