Pluto’s north polar area shows a diversity of geological and compositional features in enhanced color. Long canyons — the largest is about 45 miles (75 km) wide — run vertically across this region. Roughly parallel subsidiary canyons to the east and west are approximately 6 miles (10 km) wide. The degraded walls of these canyons appear much older than the more sharply defined canyon systems elsewhere on Pluto, perhaps because they are made of weaker material.