The Saint Lawrence River is partly within the U.S. and as such is that country 's sixth oldest surviving European place - name .
Because Cartier arrived in the estuary on Saint Lawrence 's feast day , he named it the Gulf of Saint Lawrence .
The Saint Lawrence     is partly within the U.S. and as such is that country 's sixth oldest surviving European place - name .
Because Cartier arrived in the estuary on Saint Lawrence 's feast day , he named it the Gulf of Saint Lawrence .