Ключевые слова: adventure, alternative energy, best, cascade, cascade of the marmore, central, central gallet, charm, clean energy, eco, ecology, electricity, energy, environment, environmental, exploration, force, forest, geology, green, hydroelectric power, italy, lake piediluco, landscape, marmore, mountain, natural, nature, park, plant, power, power plant, protection, rain, refreshing, renewable energy, river, sight, sightseeing, splash, splashing, terni, tour, tourism, travel, umbria, vacation, valnerina, velino, water, waterfall, wave, wonder, world,