"In modern mapping, a topographic map is a type of map characterized by large-scale detail and quantitative representation of relief, usually using contour lines but, historically, using a variety of methods. Traditional definitions require a topographic map to show both natural (e.g. mountains, valleys, lakes) and man-made (e.g. roads, boundaries, railroads, major buildings) features. A topographic map is typically published as a map series, made up of two or more map sheets that combine to form the whole map. A contour line is a combination of two line segments that connect but do not intersect; these represent elevation on a topographic map."