This is an actual map of the metro lines running in and out of the DC metropolitan area. I chose this map because I have been tasked in another class to define the DC metropolitan area using a definition that you may find suitable. This map helps me get a general idea of how I will create my definition for the area. I also chose this map because I believe this map is far more useful than the standard map of the metro lines(see link provided). While the metro map that is plastered on Metro train walls is practical, this map definitely gives more information and can be interpreted spatially unlike the other one.
Pictures of this map and practical metro map