Canada is one of the few developed nations that are net exporters of energy. Atlantic Canada possesses vast offshore deposits of natural gas, and Alberta also hosts large oil and gas resources. The vastness of the Athabasca oil sands and other assets results in Canada having a 13 percent share of global oil reserves, comprising the world's third-largest share after Venezuela and Saudi Arabia. Canada is additionally one of the world's largest suppliers of agricultural products; the Canadian Prairies are one of the most important global producers of wheat, canola, and other grains. The federal Department of Natural Resources provides statistics regarding its major exports; the country is a leading exporter of zinc, uranium, gold, nickel, platinoids, aluminum, steel, iron ore, coking coal, lead, copper, molybdenum, cobalt, and cadmium. Many towns in northern Canada, where agriculture is difficult, are sustainable because of nearby mines or sources of timber. Canada also has a sizeable manufacturing sector centred in southern Ontario and Quebec, with automobiles and aeronautics representing particularly important industries.