Ключевые слова: acid, acidic, acidity, air, ancient, area, asia, asian, bath, current, flowing, green, gunma, health, hot, hotel, japan, japanese, kusatsu, landmark, nagano, natural, old, on sen, onsen, open, open air, oriental, outside, peace, relax, resort, rural, ryokan, sightseeing, source, spa, spring, steam, stream, sulfur, sulphur, tourist, tradition, travel, trip, vapor, water, wood,