About This File
Well, then. Here's a nice seaport region to place those neat new upgradeable ports that just got added to the mix.
At 2,400 miles from the nearest open ocean, the Twin Ports of Duluth, Minnesota ("The Zenith City of the Unsalted Seas!") and Superior, Wisconsin (uhh ... "Some Mill in Wisconsin!") are the furthest inland deepwater ports in the world. Despite this -- and despite being ice-bound four months out of the year -- they were briefly the busiest shipping port in the US, and through most of the twentieth century second only to New York City in the sheer volume of goods that passed through their docks annually.
This 20x20km map is based heavily on USGS charts, but tempered with an old 1881 map of the harbor area, in order to recreate as much of the "undredged" version of the region as I could reasonably estimate. So Arrowhead purists will have to redig the canal on their own (or if you prefer Indian Head country ... don't even bother, eh?)

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