Contour lines are lines on a map that connect points of the same height or elevation. They help us understand the shape and steepness of the land, like mountains, hills, and valleys. Full definition
This medium provides an engaging set of challenges in terms of color, composition, and representation, all beginning with an initial contour line drawing. (inliquid.org)
That theme is apparent in angled contour lines down the sides. (cnet.com)
The player map even includes contour lines, making it easy to find high ground. (gamingtrend.com)