First things first: place names. The large eastern lake/inland sea is known as Lake Ningi, and the river is the Dhide River. The Shaituhu name for the central lake bordered by Pegi Rente, Samas, and Shaituhu is Lake Tuxa.
Okay, now for states.
The upstart of the group is the
Zhedai Ascendancy, ruled by the eponymous city of Zhedai. Over the last hundred years it has managed to establish control over the entire Dhide river, making it the most populous, and richest, Shaituhu state. Only twenty years ago, having secured the border with the Samas barbarians, the most recent ruler-general began expanding north along Lake Tuxa, and succeeded in conquering most of its east coast, though holding it may be a different story.
The Zhedai Ascendancy's expansion has so far been held in check by the oldest of the post-Great Collapse states,
Sisai. Sisai has held its current territory for the last 300 years under a stable power-sharing agreement between the four major cities in its territory. Constant battles with the Pegi Rente states have given Sisai an experienced army and advanced navy.
Most of the action in Sisai before the recent incursions by Zhedai was to be found away from Lake Tuxa in the east along the coast, which Sisai has steadily been developing through successive waves of immigration. A limit on its expansion at the moment is provided by the city of
Dhauhai, a city-state that managed to survive the Great Collapse mostly unscathed. Dhauhai is still ruled by a aristocratic caste, rather than a family, and the entire city is organized according to the caste system. Most notably, Dhauhai is the sight of the still-standing ziggurat to the God Theksighi, overseer of Shaituhu society and the caste system. Dhauhai is also blessed by an outstanding natural defensive location, as well as being the main gateway between the western and eastern branches of Shaituhu civilization. Though it would be a rich prize, both economically and symbolically, for either of the larger states that border it, Dhauhai has thus far managed to stand strong.
Dhauhai's eastern neighbor is the
Haitsu Principate, which after securing its place on the mainland has aggressively been incorporating Shaituhu settlements across Lake Ningi through a combination of economic and military pressure (enforced by Haitsu control of entry and exit from the lake). The Principate is currently expanding to the east, but would not hesitate to move in the opposite direction if it saw an opportunity.
Finally, along the south coast of Lake Ningi is the
Dzixau Confederation, a relatively new entity created originally to resist incursions from the natives to the east and south, but which in recent years has found itself acting as a counterweight to Haitsu ambitions of further expansion.
What's in the rest of Shaituhu land? All along the coasts of Lake Ningi are small city-states and farming/fishing settlements, focused more on trade and repelling raids to worry about any larger organization. The center of Shaituhu lands, meanwhile, is a mix of small family/clan-based farming settlements and barren, unsettled land.