contour line, shape, form, configuration, line, contorno, contourlet, outline, edge, contour map, more...

flatness, uniformity, evenness, smoothness, levelness

convex, concave, curved, straight, wavy, flat, more...

normal, general, irregular, smooth, melodic, closed, foot, facial, rounded, double, outer

shadow line,   line over shape,   line on a map,   line on map,   sharp lines,   traced line,   discrete line,   traced lines,   many map lines