Why did the painter paint the wall for free? Because it was on the house.
The answer is: Roc Warrior. It can occupy and cross water hexes. And no, I think that hex is a regular river hex, not a ford.
I agree with this completely, but just wanted to add that the rules allow both players to place a ford token after terrain is placed and before deployment, so that deployment spot could be made a ford and then any unit could deploy there.