This map depicts Canada's 2 great parts: the Shield and the Borderlands. The Shield consists of a core of old, massive, Precambrian crystalline rocks and covers half the country including most of Quebec and Ontario, the majority of Nunavut and Manitoba and all of northern Saskatchewan and eastern Northwest Territories. The Borderlands regions are formed by younger rocks and surround the Shield. The Borderlands' 7 physiographic regions include: the Appalachians in Atlantic Canada, the St. Lawrence Lowlands in southern Quebec and Ontario, the Interior Plains in central and northern Canada, The Cordillera in Western Canada and 3 arctic regions: Arctic Coastal Plain, Arctic Lowlands and Innuitian.