from A Map of the Peninsula

...

These contour lines and layered browns
are mountains, this cartographic line
of blue that picks up thin blue streams,
a river drying in the ocean's far
too democratic green. Soak the map
in rain and when this cheap dye runs 
only glaciers and the river names remain. 

~ Richard Hugo

[USGS Sierraville quadrangle, 1894]