Yes, of course it's surprising. I think there are three lakes: Lac Memphrémagog, Lac Saint-Jean, and Lac des Deux-Montagnes. There are only a few rivers: the Richelieu, the Saint-Maurice, the Ottawa, and of course, the St. Lawrence. Yes, it's surprising.
Did you want to know why I think that is? Frankly, it seemed that if you were to overlay a map of the protected waters and a political map of Canada, you would get your answer, which is that at the time there were not very many MPs to stand up and fight for their constituents.