General Info: 19, male, from Jersey, in college

Anywho, for the past several years I've been having incredibly lucid dreams. My degree of control over events and surroundings is nil, but I have a good degree of control over actions, which basically turns my dreams into a story that I'm a part of.

The thing is, while the story changes from dream to dream, the location is pretty cohesive. In fact, I've been able to construct a map of my "dreamland" by piecing together where places are in proximity to each other. It basically consists of a major city on the north side of a river, and a bunch of surrounding suburbs south of the river.

I know lucid dreaming isn't super rare, but how rare is it to have dreams fit together topographically like this?