沢登り

Via tmn, we learn about a particular subset of mountaineering called sawanobori—literally stream-climbing that involves ascending a tributary to its source be that up and over ravines and waterfalls and always against the current. Although speciality gear is usually now employed—as the video advertises—traditionally climbers wore straw-rope shoes called waraji (草鞋), differentiated from other sandals by how the toes protruded over the edge to help one gain a purchase whilst hiking up an incline.