Question

In a map brown color is used showing for what

Answer 1

If you’re talking about brown lines, those are for topography. They indicate the elevation of where they are. Many lines close together means that it’s steep, and lines far apart indicate a flatter area.
Hope this will help you.... ✌

Answer 2

Brown places indicates ground on topography sheet. The height of contours the height of land from sea level. Topographical maps was introduced by The Survey of India.