Pumpkin Spring: orange travertine, geothermal mineral water pool. Colorado River Mile 212.9, Grand Canyon NP, Arizona, USA.
Pumpkin Spring is a geothermally-heated mineral water pool surrounded by bright-orange travertine on the shore of the Colorado River at Mile 212.9. Pumpkin Spring isn't safe for bathing or drinking due to high concentrations of arsenic, lead, and other minerals. Day 15 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA.