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Other explorers searched for a river system leading through North America. The St. Lawrence River-Great Lakes system was explored in the hope of finding westward links to the Pacific Ocean. Samuel Hearne's overland trip to the Arctic Ocean, 1770–72, proved that no strait or river led from Hudson Bay to a western ocean. As a result of the overland journeys to the Pacific by Alexander Mackenzie (1792–93) and Lewis and Clark (1804–06) it became obvious that the only location for a northwest passage would have to be in the far north of Canada.