Oh man, I just figured out why the River's in there: I figure they were thinking of the Arnold movie "Conan the Destroyer" where Conan & his friends are sneaking in through the hidden underground cave, under the waterfall, where Tracy Walter says, "My sister's brother's cousin never mentioned this" and eventually Grace Jones screams "Who cares whose sister's brother's cousin it is!" while Arnold's pulling the bars! God, what an awful movie. :lol:
Now that's a justifiable reason to put a river in a city if ever I heard of one, to accomodate a poorly written slapstick scene in a bad movie!