Sonar Maps are used to show depths of water and can be used to show what is located on the bed of the body of water. This is a map of a lake and inside the contour lines they show the level of the water. You can see that it is almost a reverse cliff because if all of the contour lines were going up it would make a cliff, but because each circle goes deeper and deeper, there is no cliff. The deepest part of this lake is in toward the top of the map.
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