Civilization: Confederation of the Red River
Fortress city: The red Gate
-Smaller communes will not be named
Leader: None. It's a semidemocratic confederation relying on representatives and a bureaucratic system. In practice, the 5 chosen leaders of the villages and some other representatives decide what happens.
History: The delta of the Red river has always been a fertile land. The flooded surroundings allowed for large rice harvests, and wildlife and others were plentifull. While disease and pests are a risk, these have been mostly mitigated by storing all important goods in the central fortress that was build by the villages. Thanks to the large food harvests, and the limited risk of invaders, the society flourished and quickly expanded. Technological advances were quickly made, almost all thanks to a growing intellectual elite class.
The Red Gate:
The name of the fortress is twofold. Firstly, from it's hightened position in the middle of the delta it controls all traffic going up and down the Red river. The other explanation is it's outlook. There are nearly no rocks in the swamp, and as such the fortress was constructed from thick layers of baked red clay, molded and fit amongst a wooden frame. While the clay is certainly not as strong as normal stone, it's lightness and large availability easily make up for that. The walls are very thick, but mostly hollow, preventing the construction from collapsing while allowing defenders much more space to defend from . Thick layers of softly baked clay on the outside protect against all sorts of projectiles, as well as grappeling hooks while the wooden framework keeps the entire thing together. The entire fort is constructed in such a way, that in an emergency (like a breach), they can lock of parts of the wall, or even let them collapse.