The State of Michigan geographically dominates the Great Lakes watershed, which encompasses the largest system of freshwater lakes in the world. Michigan's shoreline extends for 3,288 miles, longer than any state except Alaska. It has over 35,000 inland lakes one-tenth of an acre or larger and more than 200 rivers with a total length of 36,350 miles. A total of 172 extant species of fish are present in the Great Lakes and their tributaries, of which 153 are found in Michigan waters. The objectives of this atlas are to provide detailed digital distribution maps by species for Michigan fishes with explicit keys and illustrations for their identification.