© Istockphoto| Grand Canyon, Arizona, Stati Uniti 

© Istockphoto| Brimstone Slot Canyon, Utah, Usa  

© Istockphoto| Canyon del Colca, Arequipa, Perù

© Istockphoto| Fish River Canyon, Namibia

© Istockphoto| Blyde River Canyon, Sudafrica  

© Istockphoto| Fjaðrárgljúfur, Islanda 

© Istockphoto| Gole del Verdon, Provenza, Francia 

© Istockphoto| Gola del Furlo,  Marche

© Istockphoto| Kings Canyon, Australia 

© Istockphoto| Gola dell Indo, India