A blue shadow falls across the turquoise river waters of this canyon.

Sunrays shine down on mist over a canyon river in a desert wilderness.

Antique Illustration of a View of a Waterfall in the Rhine River. (Location: Germany)

Nagatoro Canyon, Woodcut, Saitama Prefecture, Japan

Antique Illustration of a View of a Waterfall, "Lower part of the great fall of the Fynnachl"

Antique Illustration of a View of a Waterfall in the Rhine River. (Location: Germany)

Antique Engraving of a Canyon View with a Waterfall, "Falls of the Polufuca on the River Liffey" (Location: Ireland)

Antique Engraving of a View of a River and Canyon with Bridge, "Hermitage at Dunkeld" (Location: Scotland)

Artist's concept of a river on early Mars.

Lush tropical jungle, river systems and waterfalls on an alien planet.

Cosmic seascape on another world with a ringed planet in the night sky.

Morning mist surrounds the mountains of this beautiful valley.

Grand canyon Colorado river