What does a contour line represent on a topographic map?

A contour line on a topographic map represents a continuous line of a given elevation. This means that any point along a contour line is at the same height above sea level, which allows map users to visualize the terrain's shape and steepness. By connecting points of equal elevation, contour lines help indicate landforms such as hills, valleys, and slopes.

The spacing between these lines can indicate the steepness of the terrain; closely spaced lines suggest a steep slope, while wider spaced lines indicate a gentle slope. This fundamental concept is essential for various applications, including hiking, civil engineering, and land use planning, where understanding the layout of the land is crucial.