An isopleth map is the general term used to describe any map which employs lines or colors to indicate areas with similar regional aspects. In this sense, isopachs, isobars, and many others are all isopleth maps. Isopleth maps are helpful in visually simplifying one general patch of information of a broad area. In the map below, color variations as well as number values are used to depict the pH levels of hydrogen ion concentrations throughout the U.S. and it is easy to determine with only a glance that the pH is higher on the west side of the country.
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