This is a list of minor terrain features, the minor locations that can be dropped in anywhere just to add "narrative flavor", to make it more than just another road, field, forrest, beach. These are not settings or even whole areas, these are things you can "drop" into the world to add color and versimilitude. The original list is still open for your additions!
There is an important pair of fraternal twins. Possibly minor dieties, sorcerers, or maybe just an important pair of nobles. One is evil and one is good. The thing is, the one who looks evil at first glance is the good one, and vice versa.