Above is a map of the Texas River Basins and Major Bays. One main drawback of this maps is the enormous number of colors used to represent the data. It may have been better to provide some other method of distinction in addition to the use of colors. This may include adding numbers to the areas, or even patterns/textures. In addition, the map is heavier on the left where the keys reside. Aside from that, clarity, legibility, and visual hierarchy are good.
source:
http://www.tpwd.state.tx.us/landwater/land/maps/gis/map_downloads/map_gallery/hydro/
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