Both exploration and the fur trade opened up Canada's Northwest Territories, a land for pioneers. The magic of gold once lured thousands into the Yukon, but greater riches lie east of the Klondike, imbedded in the rocks and tundra of the Canadian Shield. The farm areas, the fisheries, the forests, and the rivers of northern British Columbia and the Prairie provinces also promise wealth. The Alaska Highway opened up potential grain fields, and air routes form a close link with the busy centres of the South, encouraging industrial development.