Hexagonal cross-sections of basalt columns on Whitmore Trail, Colorado River Mile 187.9, Grand Canyon National Park, Arizona, USA.
Hexagonal cross-sections of basalt columns. Hike Whitmore Trail (about 3 miles round trip with 920 feet gain) from Colorado River Mile 187.9. Day 14 of 16 days rafting 226 miles down the Colorado River in Grand Canyon National Park, Arizona, USA.