Rivers are great sites for starting cities and civilizations dues to the richness of riverbank soils and natural trade routes for boats. Rivers are as good as Grasslands for producing food and always generate trade. River terrain may be irrigated to increase food production. It was no accident that the first civilizations sprang up along rivers. Roads can be built across rivers after Bridge Building is discovered.
Rivers produce 2 food, either 0 or 1 resource and 1 trade.
It costs 1 Movement Point to travel over a River region.
Rivers offer a +50% defense bonus.