This channel is an archive of audio podcasts. Most of them were produced during 2009 and 2010 by Grand Canyon National Park Ranger Patrick Gamman. Topics include anything and everything about Grand Canyon. A powerful and inspiring landscape, the Grand Canyon overwhelms our senses through its immense size. Unique combinations of geologic color and erosional forms decorate a canyon that is 277 river miles (446km) long, up to 18 miles (29km) wide, and a mile (1.6km) deep.