Fords. Waterways, not trucks.

[Papa Juliet Whiskey]

It would be cool to see a water tile that blends with the normal ones, but are shallow enough to walk across, so could have animated water over rocks or some such. Cool way to add small streams and things without fully blocking overland travel. Bridges would have to be built otherwise, or have ugly breaks between water and land tiles. It could also be a unique foraging zone, yielding more stones. 

 

Who doesn't like rock? 'twas the 90's, after all.