Question

what is use of blue in topography map? and how are you all​

Answer 1

Answer:

The color brown is used to denote most contour lines on a map, which are relief features and elevations. Topographic maps use green to denote vegetation such as woods, while blue is used to denote water features like lakes, swamps, rivers, and drainage.

Answer 2

Answer:

it is used to mark perennial rivers,streams,dams,canal etc.