Our cruise from Manhattan to Toronto continues on the Viking Octantis.  We are on the St. Laurence Seaway. Seaway, because there are locks on the western portion of the St. Lawrence River. River flows from the Great Lakes in a northeasterly direction from Lake Ontario into the North Atlantic Ocean, and is #2 to the Mississippi River in North America. Remember my saying that a drop of water takes about three months to travel the entire length of the Mississippi River to the Gulf of Mexico?  Similarly, this hypothetical drop takes 6 to 8 years to pass through Lake Ontario to the Atlantic Ocean.  Or, from the furthest Lake Superior extreme, more than 200 years. Among the highlights include: Is fresh until around the city of Quebec, and eventually is ocean salty near Tadoussac. Portions of the seaway have peak tides up to 20 feet twice daily.  You would thus think that tidal plants would be prominent, for studies estimate a potential of 1.5 gigawatts, or 1555 megawatts. ...