This is a topographic map of the Grand Canyon, approximately the area that the National Park resides in. Just having returned from a trip to the Grand Canyon, this map has significance for me. Note how closely the contour lines are placed within the canyon, representing the sheer cliffs and steep walls. Contrast that with the sparse contour lines up on the rim of the canyon where the land is fairly flat. This map originally came from a link on a professor's web page that teaches a class in Physics at Davidson University in North Carolina. http://webphysics.davidson.edu/faclty/dmb/py220/grandcanyon/jpg