Sto Plains

In Terry Pratchett's Discworld, Sto Plains is a rich country, full of silt and cabbage fields. Every inch is covered by a neat little kingdom. These kingdoms' borders are ever changing, like wriggling snakes as formal wars, marriage pacts, complex alliances, and bad mapping change the political shape of the land. The thick, black, rich loam of the Sto Plains was constructed over aeons by periodic flooding of the Ankh (river) and every bit of it has at some time travelled along someone's alimentary canal.