Geology and Drainage
Quetico is near the southern edge of the Canadian Shield, an exposed 1000-mile expanse of ancient Precambrian rock, some of which is among the oldest exposed rock in the world. The park consists of a large number of "young" lakes (only tens of thousands of years old) contained by this ancient bedrock. Due to its proximity to the Laurentian Divide, the park can be considered to be in the headwaters of the Hudson Bay watershed. The southern part of the park is drained by the Basswood River, the central and eastern parts of the park by the Maligne River, and the northern part of the park by the Quetico River. All of these rivers flow into the Namakan River west of the park, which then flows into the Rainy River, Winnipeg River, Nelson River and finally into Hudson Bay. This helps to make it, along with the adjacent Boundary Waters Canoe Area Wilderness, the most popular canoe area in the world.
Read more about this topic: Quetico Provincial Park