(Not to be confused with Mitchell's School Atlas.) The Mitchell Map is a map made by John Mitchell (1711–1768), which was reprinted several times during the second half of the 18th century. The Mitchell Map was used as a primary map source during the Treaty of Paris for defining the boundaries of the newly independent United States. The map remained important for resolving border disputes between the United States and Canada as recently as the 1980s dispute over the Gulf of Maine fisheries. The Mitchell Map is the most comprehensive map of eastern North America made during the colonial era. Its size is about 6.5 feet (2.0 m) wide by 4.5 feet (1.4 m) high.