Contour lines join areas of equal height and are shown in orange on an Ordnance Survey (OS) map. The number written on the contour line shows the height above sea level in metres.

Google has announced a new feature to the terrain relief maps they added last November to Google Maps. Now when you zoom in closer, the terrain shows contour lines to give you an even better feel ...

Learn about essential map skills including how to work out direction, how to show height on a map and what map symbols are.