autumn scenery of colorful maple trees on the rocky cliffs by hoheikyo dam in a beautiful gorge under environmental protection in

autumn tree mountain leaf wilderness nature plant forest landscape ridge winter flower snow valley rock hill woodland geology trail scenery colorful maple trees rocky cliffs hoheikyo dam beautiful gorge environmental protection shikotsu-toya national park sapporo hokkaido japan arch background beauty concrete dynamic embankment energy engineering environment fall foliage infrastructure peeping magnificent majestic mountainside natural outdoor power reservoir river rugged scenic season sight sightseeing tour tourism travel trip vertical view viewpoint water