It's crazy, and long. Thanks for the information by the way. Yeah, you're right Idown. I'm looking for a way to find contours of maps I've made.
Pretty much, the only way I can envision is to create a water level around the entire map. Then raise it to the specific intervals you want and texture the edges where the water meets land. Save this as a separate file, and when you go into map view it'll give you a contour. I haven't tried it yet, because it's so insanely crazy.