Rivers Suggestion

While discussing ideas for the game regarding the 2.0 release, we (people in the in-game global chat) came to the idea of adding rivers to the game. This would add something new to the map, and units would go through a faster version of embarking to cross the river. It could also be designed so units positioned on defense near the river would get some fortification bonus or something similar. And finally, building bridges to reduce embark time or including so in infrastructure.