How to read the terrain
- 1Find the contour interval (printed on the map) so you know how much height each line represents.
- 2Judge steepness by spacing — bunched lines = steep (maybe cliffs); widely spaced = gentle or flat.
- 3Read the shapes: concentric small circles = a hill or peak; lines making a V or U across a stream = a valley, with the V pointing upstream; lines bulging outward downhill = a ridge or spur.
- 4Use the index (bold, numbered) lines to read actual elevations, counting intervals from them.
- 5Match contours to the real world — spot a peak, a saddle, or a valley on the ground and find its contour signature.
- 6Plan routes with the contours — following a contour (one elevation) is easy walking; cutting across many lines means a hard climb.
When to use it
- Judging before you go whether a route is a gentle valley walk or a steep ridge climb.
- Identifying landforms — peaks, ridges, valleys, saddles — to navigate by terrain, not just trails.
- Choosing campsites (flat, above drainages), water sources (valleys), and safe routes (avoiding cliff bands).
Common mistakes & safety
- Bunched contour lines can mean cliffs. Never plan a route straight up or down tightly packed lines without knowing what's there — that's how people get cliffed out.
- Reading the V wrong reverses a river. The contour V points upstream — get it backwards and you could plan against the current or misjudge a drainage.
- Terrain association is your backup when lost. Match the shape of the land to the contours to relocate yourself, even without a trail sign — stop and study rather than pushing on.
- Steepness affects time and energy, not just possibility — closely spaced contours mean slow, tiring travel; budget for it.
- Contours don't show ground cover. A gentle slope on paper can be thick brush, talus, or swamp — combine contours with symbols and local knowledge.
Going deeper
- Landform signatures worth memorizing. A hilltop is concentric closing circles; a valley is a V pointing uphill (upstream); a ridge is a V pointing downhill; a saddle is the dip between two hilltops; a depression shows little tick marks on the downhill side.
- The "rule of V's." Valleys and ridges both make V shapes — the trick is which way they point: valley V's point uphill (upstream), ridge V's point downhill. Water is the tiebreaker.
- Counting the climb. Multiply the number of lines you'll cross by the contour interval to estimate total elevation gain before a hike.
Official source
How to read a topographic map — Scout Life →Contour reading is part of the Scouts BSA navigation requirements and the Orienteering merit badge.