Jouan Rius / Antelope Canyon, a slot canyon with eroded sandstone patterns, Navajo Tribal Park, Arizona, USA, December 2012.

Gavin Hellier / The 'Mittens' at sunset Monument Valley Navajo Tribal Park, Arizona, USA

Yva Momatiuk & John Eastcott / Cirrus and cumulus clouds over mesa, Monument Valley Navajo Tribal Park, Arizona

Tim Fitzharris / Sand dunes and the Mittens, Monument Valley Navajo Tribal Park, Arizona

Jim Brandenburg / Desert Spiny Lizard (Sceloporus magister) sunning on rock, Monument Valley National Monument, Arizona

Sylvain Cordier / Navajo Generating Station, an coal fired power plant, Arizona, USA. April.

Sylvain Cordier / Wild horses, Monument valley tribal park, Navajo reserve, Utah, USA. April.

Jouan Rius / West Mitten Butte and East Mitten Butte, Monument Valley Navajo Tribal Park, Utah-Arizona, USA

Jouan Rius / East Mitten Butte and juniper tree, Monument Valley Navajo Tribal Park, Utah-Arizona, USA

Jouan Rius / West Mitten Butte, Monument Valley Navajo Tribal Park, Utah-Arizona, USA

Ingo Arndt / East and West Mittens, Monument Valley, Navajo Tribal Park, Arizona, USA, September 2010

Ingo Arndt / East Mitten, Monument Valley, Navajo Tribal Park, Arizona, USA, October