MattII
Prince
When I played Civ 3 I was quite annoyed that I could not move my ships between two squares of land that only touch at the corner. I have never tried placing a river on the join to see what it does, but I suspect ships still can't cross. I therefore propose that on a diagonal join between two squares, units can move between the squares if nothing is there and ships can move if there is a river on the corner.