Hypsometric map

Hypsometric maps represent the differing elevations of the earth's terrain through the use of shading and colors. Hypsometric colors are most common in small scale topographic maps and are applied as continuous gradients or intervals. Most often the shading gradient will begin with lighter/brighter colors depicting the lower levels of elevation, and as the elevation increases the shading becomes darker and darker. This is illustrated on the hysometric map of the Greek island of Boiotia. On the left hand portion of the map you can see the dark areas of shading which represents the highest points of elevation on the island, most likely a mountain.

http://www.uam.es/proyectosinv/sterea/beocia/images/figure_8_gis.jpg