Region descriptions should be about the region, not about the realm. They should not make any reference to the political situation, what realm they are part of, what the capital is, or even the name of the lord.
Things you should talk about:
* Geographical features
* Geographical location (but not political location, i.e.: "On the main road between Perdan city and Aix" is good. "Between the great twin cities of Perdan" is bad.)
* Descriptions of the locals
* Important historical events that occurred there
* Cultural items of significance, like the favorite drink, conditions of the hunting, how the locals make their living
Things to avoid:
* Current political affiliation of the region
* Names of the current king/duke/lord
* References to it's relation to the capital of the realm
Region descriptions should be timeless. They should still apply no matter who takes control of the region in the future.
