Stretching between the Great Lakes and Hudson Bay, Ontario, Canada’s most populous province, is a place of dramatic contrasts. The Great Lakes-St. Lawrence Valley in the south is the center of agriculture and industry. To the north, the Algoma Central Railway’s trains traverse the endless wilderness. In the southwest, the Fathom Five National Marine Park on Lake Huron’s Georgian Bay is an underwater preserve where scuba divers and glass-bottom boaters encounter old shipwrecks.