a smooth curve of the channel of the colorado rive, a whirlpool, animals, arizona, bird, car, clouds, denver, desert, egypt, fly, giza, glen canyon, horseshoe, horseshoe bend, landscape, mile high city, mountain, nature, river, road, rock, roxborough state park, roxborough’s geological wonders, scottsdale, sky, sphinx, square wave, stones, temple, united states, usa, waterfall