Question

what is the meaning of blue line in the river of toposheet​

Answer 1

Explanation:

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

Explanation:

the colour brown is used to denote most contour lines on a map