The contour lines are shown by brown colour as thick brown lines and thin brown lines. Contour lines show:
1. Elevation of land: The height of a contour is indicated by figures inserted in a break in the line.
2. Steepness of its slope: When the contours are very close, they represent steep slopes. When they are farther apart, they represent gradually increasing slopes. Absence of contour lines indicate that the land is flat i.e., a low land.
3. Shape of land at various heights: The contour lines indicate the shape of land. For example, almost circular contours whose value decreases inside represent a lake.