a smooth curve of the channel of the colorado rive, alberta, arizona, bavaria, bayern munich, boat, canada, castle, clouds, crater, fence, ferry, fog, forest, fortress, germany, glen canyon, grass, hills, horseshoe, horseshoe bend, ice, ice floes, lake, lakes, landscape, mountain, mountains, nature, night, northern lights, old, oregon, river, road, sail, sailboats, sea, ship, sky, sky ., square wave, star, summer, sunset, the field, tree, trees, united states, water