ll provinces have natural water sources, whether they be lakes or rivers. Many provinces feature a river which can be used for trade: you can spot this river from the flotsam which floats on the surface of the river, and is carried through your province by the river's current.

Your engineers have designed two clever bridges, which are adaptable to different sizes of river. One is cheap and can be built in many places, but does not permit ships to pass underneath it, while the other is sturdier and taller, does allow ships to pass underneath, and is understandably more expensive. Pedestrians will walk happily over both types of bridge, even with carts.

Note that rivers may only be bridged at certain points, usually where there are two fairly straight, even river banks opposite one another, enabling your engineers' construction methods to hold.