Georgian Bay is almost as large as Lake Ontario and would be the “sixth great lake” if the Bruce Peninsula had extended all the way to Manitoulin Island. The length of the Bay is 200 km and it averages about 75km in width. In the Thirty Thousand Islands region along the eastern shore, the landscape is part of the rugged Canadian Shield. In this region the shield is made up of Precambrian rock that swells up out of the water in clusters of low-lying islands that were scraped almost bare by glaciers during the ice age. This wild and rugged shoreline presents a stern resistance to the encroachment of man and helps maintain the region’s remoteness.