This map is an example of a thematic map. The main difference between thematic maps and traditional maps is that thematic maps work to show a particular theme. In the example above, we see the theme of soil depth to the watershed in Illinois. We can see that the map is not primarily concerned with showing the area of the state like traditional maps. This is evidenced by the fact that the borders of the state are "ghosted" out and the only thing we can see is the outline of the major watersheds that lay within the state. Generally, thematic maps start with a traditional map as a base and then overlay the themed map on top. They are not concerned with things like rivers, mountains and roads, like a regular map, rather, they are interested in enhancing the understanding of the reader of the particular topic at hand.
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