[@agentmanatee]

Incest? :P 

They have Lannisport. Which without a shadow of a doubt, is the most significant port city in Westeros bar King's Landing, the second largest population too. It's a significant store of everything, no doubt, it's a beating heart that circulates it's wealth to the Riverlands and even to the less accessible part of the North-Western Reach. 

And Garland has plans too, well rather, his sister does...