This is a 3.1-mile (5.0 km) out-and-back from Buttermere village, with the return counted in the distance. The map draws the physical corridor once from the Bridge Hotel area to the tarn because the same path is retraced. Allow about two hours at a normal sightseeing pace.
From beside the Bridge Hotel, take the lane toward the lake, pass through the field gates and follow the shore path to the footbridge. Cross Buttermere Dubs, then continue up the steep stone-pitched path beside Sourmilk Gill. The route climbs through Burtness Wood, passes a gate onto open fell, and zigzags beside the upper gill before crossing rough ground and a small stream to reach the tarn. Return the same way.