The relationship between actual distance and distance shown on a map. The definition of a map scale may lead one to believe that it is simple, but showing this relationship is not that simple.
This is because the Earth is curved, which can make showing the distance more difficult. The first step of finding a map scale is to find it on the outer part of the map. If one is not able to find it there, then they can try to locate a map key or a legend. These tools will help one understand the map.