43.6% of the  area of lakes in north america is occupied by Lake superior and 13.6% of the area of lakes in north america is occupied by Lake Michigan.
 Explanation:
- Superior, the biggest of Great Lakes, is also the hugest freshwater lake by covering the region, and the 3rd-largest freshwater lake by size. 
- The Great lake also declared the Great lake of Laurentian and the   Superior Lake is the 2nd  world largest lake by region, and the biggest freshwater lake by region. 
- Michigan  Lake, the particular item of the Great Lakes which  is wholly within the U.S; the others form a water barrier