This map is an example of a topographic map, which is meant to show the elevation of an area. In this case, it shows the elevation of New Bedford, Massachusetts. Note how the map shows elevation through the use of irregularly shaped rings, where peaks are the center circles, while the increase/decrease in elevation shows how steep the slope gets.
Where example was found: http://www.mass.gov/mgis/usgs_hist_coastal.htm
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