The Nature Calan is a trail race in Calan, a commune in Morbihan, Brittany. It takes place in April with two distances: 12.4 km and 4 km, suitable for regular trail runners and those seeking a compact local race.
The 12.4 km route is a single loop on local hiking paths, consisting of about 90% trail and 10% road. The main race begins in the early evening. All finishers receive a reward, and a recent edition saw record participation, indicating this is a well-supported local running event.