Ключевые слова: architecture, background, beautiful, blue, bright, building, canal, cloud, clouds, colors, conflict, danube, destruction, ecology, environment, environmental protection, europe, flora, forest, grass, green, houses, idyllic, landscape, modern, natural, nature, nature conservation, near river, outdoor, park, plant, regensburg, river, rural, scenic, season, serene, settlement, sky, spring, stream, summer, sun, threat, town, tree, urban, view, water,