so, can the French sail into the Saint Lawrence River and found a city "where the river narrows"?
The best way I've found is to use the gigantic RaR Americas map and world-build a water way up-river to Montréal. Even on the world map it's big enough to take a few days to sail from Québec to Montréal. ( no modelling of "current" in civ 4, but this RaR mod makes up for things like that in granularity of economics.)
It would be really nice to have a gigantic "top of Hudson's Bay, and just east coast to the western edge of Wisconsin, and south to the panhandle of Florida" map. With that much detail you'd really start to have a feeling of geography and not just 'empires to conquer' (which we've been conquering since the early '90's and it's kind of more fun in Rome II., and I like the economic particulars even in total-war worlds. ) OK, Bermuda and Bahamas for the British, but who's them guys? "Washington"? "Penn"? later on that; and, forget "Independence"... What would the Swedes want with independence from Sweden? -- things were tough enough.