Question: What stretches north from the Great Lakes to the Arctic Ocean and includes the Frontenac Provincial Park as an extension of it?
Context: La Verendrye Provincial Park is a waterway provincial park located in Ontario, Canada, on the border of Minnesota, United States.  The park stretches from Quetico Provincial Park through Saganaga Lake, up the Pine River, across the Height of Land Portage, then down the Pigeon River to Pigeon River Provincial Park on Lake Superior.  The park is named after Pierre Gaultier de Varennes, sieur de La Vérendrye an early explorer of Canada. Entiako Provincial Park and Protected Area is a provincial park in British Columbia, Canada, located on the south flank of the Nechako River watercourse .  It was formerly part of Tweedsmuir Provincial Park until that park was broken up; its sibling parks from that change are Tweedsmuir North Provincial Park and Protected Area and Tweedsmuir South Provincial Park. Frontenac Provincial Park is located near the town of Sydenham, north of the city of Kingston, Ontario, Canada.  The Government of Ontario has classified Frontenac Provincial Park as a natural environment park.  The park lies on the Frontenac Axis, a topographic extension of the Canadian Shield, which connects to the Adirondack Mountains, and consists of mixed forest, lakes, wetlands, and granite outcrops.  Recreational opportunities include hiking, canoeing, and backcountry camping.  Wilderness courses are offered to teach wilderness skills in a semi-wilderness setting. The Canadian Shield, also called the Laurentian Plateau, or "Bouclier canadien " (French), is a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geological shield) that forms the ancient geological core of the North American continent (the North American Craton or Laurentia).  Composed of igneous rock resulting from its long volcanic history, the area is covered by a thin layer of soil.  With a deep, common, joined bedrock region in eastern and central Canada, it stretches north from the Great Lakes to the Arctic Ocean, covering over half of Canada; it also extends south into the northern reaches of the United States.  Human population is sparse, and industrial development is minimal, while mining is prevalent. Thirty Island Lake is a lake of southern Ontario, Canada, located northwest of Frontenac Provincial Park in Frontenac County. Arctic Pacific Lakes Provincial Park is a provincial park in British Columbia, Canada, protecting a pair of lakes known as Arctic and Pacific Lakes, which as their name indicate are on the divide between the Pacific and Arctic drainages.  Inherently, the Continental Divide runs between the two lakes, which lie in a narrow valley amid the rugged mountains of the northwesternmost McGregor Plateau.  The pass formed by the lakes was important during early fur trade operations and was one of the main links between New Caledonia and the fur companies' eastern territories beyond the Rockies. Epper Passage Provincial Park is a provincial park in British Columbia, Canada, located on the north side of Vargas Island in the Clayoquot Sound region of the West Coast of Vancouver Island, British Columbia, Canada.  Also on Vargas Island is Vargas Island Provincial Park.  Other provincial parks nearby are Flores Island Marine Provincial Park, Gibson Marine Provincial Park, Maquinna Marine Provincial Park, Sydney Inlet Provincial Park, Dawley Passage Provincial Park and Hesquiat Peninsula Provincial Park.  The park was created as part of the Clayoquot Land-Use Decision on July 13, 1995 and contains approximately 306 ha. Gibson Lake is an endorheic lake in the municipality of South Frontenac, Frontenac County in Eastern Ontario, Canada.  It lies within Frontenac Provincial Park. Big Salmon Lake is a lake in Frontenac Provincial Park in eastern Ontario.  It lies in the Frontenac Axis, and is the largest lake in the park.  It is a long, narrow shaped lake, accessible by the main road into the park and by many hiking trails.  Despite the name Big Salmon Lake, there are no salmon in the lake.  There are no major islands in the lake, but there are a few small ones in the east end of the lake. The Greenland Sea is a body of water that borders Greenland to the west, the Svalbard archipelago to the east, Fram Strait and the Arctic Ocean to the north, and the Norwegian Sea and Iceland to the south.  The Greenland Sea is often defined as part of the Arctic Ocean, sometimes as part of the Atlantic Ocean.  However, definitions of the Arctic Ocean and its seas tend to be imprecise or arbitrary.  In general usage the term "Arctic Ocean" would exclude the Greenland Sea.  In oceanographic studies the Greenland Sea is considered part of the Nordic Seas, along with the Norwegian Sea.  The Nordic Seas are the main connection between the Arctic and Atlantic oceans and, as such, could be of great significance in a possible shutdown of thermohaline circulation.  In oceanography the Arctic Ocean and Nordic Seas are often referred to collectively as the "Arctic Mediterranean Sea", a marginal sea of the Atlantic.
Answer: Canadian Shield