Jeff Foott / Halgaito shale rock formation called 'Mexican Hat' on the San Juan River in south-central, Utah

Jeff Foott / Halgaito shale rock formation called 'Mexican Hat' on the San Juan River in south-central, Utah

Yva Momatiuk & John Eastcott / Dry cracked mud on river bank in desert, San Juan River, Utah

Tim Fitzharris / Eroded river valley, Goosenecks of San Juan River, Goosenecks State Park, Utah

Matthias Breiter / North American River Otter (Lontra canadensis) with crab prey, San Juan Island, Washington

David Noton / Gooseneck turns in the San Juan River at dawn, Goosenecks State Park, Utah, USA

Tim Fitzharris / La Plata River, La Plata Canyon, San Juan National Forest, Colorado

John Cancalosi / Indian Petroglyphs with human figure and Bighorn sheep, San Juan River, Utah, USA, 1993

John Cancalosi / Indian petroglyphs, human figure and Bighorn sheep, San Juan river, Utah, USA

Mark Taylor / Meanders of San Juan River, Utah, USA, cut into strata of Pennsylvanian Hermosa Formation. (Late carboniferous period)

Tim Fitzharris / Moon over San Juan River flowing through Goosenecks, Utah

Tim Fitzharris / River in canyon, San Juan, Utah