Because it crosses so many lakes , the water system frequently changes its name .
The source of the North River in the Mesabi Range in Minnesota ( Seven Beaver Lake ) is considered to be the source of the Saint Lawrence River .
Because Saint Lawrence River crosses so many lakes , the water system frequently changes Saint Lawrence River 's name .
The source of the North River in the Mesabi Range in Minnesota ( Seven Beaver Lake ) is considered to be the source of the Saint Lawrence River .