Coordinates 47.7°N 87.5°W
======================
A set of latitude/longitude coordinates describes a single point, so it's not possible
for a whole lake to be there.
The point in the first answer is located in Lake Superior, about 24.5 northeast of
Copper Harbor, Michigan.
The whole lake occupies all latitudes from 46.41° to 49.02° North, and all longitudes
from 84.36° to 92.11° West.
Latitude: N 46° 46' 29.9449" / Longitude: W 92° 5' 31.1287"
Latitude: N 47° 50.382501' Longitude: W 87° 12.436556'
Latitude: N 47° 35' 29.1501", Longitude: W 87° 13' 45.7874"
47° 42′ 0″ n, 87° 30′ 0″ w
Latitude: S 33° 59.02083' Longitude: E 141° 16.408081'
Bear Lake: 42.000873, -111.333815
Latitude: N 53° 10' 24.96", Longitude: E 107° 39' 45"
Latitude: S 1° 5' 15.0676", Longitude: E 32° 54' 57.8485"
43.741497, -77.825804
37.089267, -111.242428
Latitude: S 15° 48' 2.4363", Longitude: W 69° 23' 7.2269"
Latitude: N 42° 4' 0.7867"Longitude: W 81° 20' 23.789"