Locks exist on the St. Lawrence river because you need leveled water to sail or barge.
The St. Lawrence Seaway is the waterway system that improved transportation between the Great Lakes and the Atlantic Ocean.
st. Lawrence seaway st. Lawrence seaway
St. Lawrence Seaway
st. lawrence seaway
The St. Lawrence Seaway is named for the St. Lawrence River.
the st. Lawrence seaway connects the great lakes, the st. Lawrence river, and the atlantic ocean
The St Lawrence Seaway
It is the Great St Lawrence seaway...
St. Lawrence Seaway
Atlantic Ocean
Jacques Cartier
1534