Build your own contour map. Use the elevation data to make your own contour map from the data in Figure $2\mathrm{.}9.$ The contour interval will be $10$ m$.$ The zero$-$contour interval is at sea level; so$,$ you don$$t need to draw that one! You may have to interpolate and extrapolate the data as there are very few data points that are $10$ m intervals. Remember how the contour intervals should look around the small streams and rivers. Draw your contour lines so that they are continuous: they will either continue to the edge of the map or form an enclosed circle.