autumn at senjogahara plateau in nikko national park, nikko tochigi, japan ecological engineering methods

autumn blue city color colors destination eco ecological ecology engineering environment fall fallen field forest grassland hiking industry intensity japan japanese leaves maple marsh mediterranean methods mountain national natural nature nikko okunikko park path planks plateau prefecture scenery scenic scenics senjogahara sightseeing sky sunlight tochigi tourism tourist trail vacation vista walking wetland wilderness wood wooden