Perinnial rivers are generally shown by blue colours and no perinnial rivers are shown by black colours diagram
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Explanation:
RED -Overprinted on primary and secondary roads to highlight them. ...
BLACK -Manmade or cultural features.
BLUE -Water-related features.
BROWN -Contour lines and elevation numbers.
GREEN -Vegetation features.
WHITE -Sparse or no vegetation. ...
PURPLE -Denotes revisions that have been made to a map using aerial photos.
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