Mt. Oakan mountain trail entrance from entering, trekking doing approximately 15 minutes, primeval forest by surrounded small lake "Lake Taro" appears. Furthermore, 5 minutes about walking, "Lake Jiro" to arrival. Year-round passage is possible (winter season, snowshoes are necessary cases also), June around, Ezo purple azalea and Hakusan rhododendron's flowers are best time to see. Autumn, autumn leaves' famous place, winter also coniferous forest is beautiful. Guide absence by going occasion, bear deterrent bell bringing if, is safe.