Ключевые слова: canal, cascade, concept, countryside, creek, dam, dike, downstream, dyke, ecology, ecosystem, environment, europe, fall, flow, flowing, forest, jump, lake, landscape, levees, lock, meadow, mountain, naturally, nobody, outdoor, park, passage, power, rapid, reserve, rill, river, rural, sluice, stream, summer, tree, valley, vegetation, water, water course, waterfall, waterway, way, weir, wild, wilderness, woods,