The Sylvan Imperium
The Sylvan Imperium is an elven empire to the east of The Brandywine Plains, the neighboring realm to the City-State of Shard in that direction. As the name suggests, the Imperium is heavily wooded, though there is a fair amount of biome diversity. In particular there are wetlands and swamps along the Winding River that runs east and then south through the Imperium, starting at Lake Drokar and eventually terminating at the muddy delta where the river empties out into the Great Central Sea.
The Sylvan Imperium is actually best thought of as a great collection of tribes, small city-states and baronies that swear fealty to the Imperius or Imperia, currently Imperia Domitia Fabiana. However, the Imperial Ruler is chosen by a vote of these many supposed vassals and wields only as much central power as they are able to command through personal charisma, deal-making and their own existing power base. Notably, the Imperial Ruler is given control of Tirion, the capital of the Imperium, but must renounce all other heriditary land claims and titles upon ascension to the Imperial throne. The Imperial Rulership does not pass along familial lines and it is extremely rare that a succeeding ruler is in any way related to the previous ruler by blood. In practice this means that the Imperium functions as a fairly decentralized realm, though one capable of coming together against attacks by outside realms as evidenced by their long history of successfully repelling invaders.
As a realm, the Sylvan Imperium is dedicated to the worship of Corellon at the Imperial level, and many of the civilized world’s finest centers of magical study and lore can be found. Worship of Melora and Selahine is also fairly common amongst the citizenry. The Imperium does not allow non-elven folk to vote for the Imperial ruler and only a full-blooded elven person may ascend to the Imperial throne, but otherwise those other races who choose to live by the laws of the Imperium and its component parts are allowed to live, work and have the full protection of Imperial law. Though there can be a mild strain of elven superiority culturally, and a few elven supremacists here and there, this is the exception and not the rule.