Here's your one-stop guide to identifying Washington peaks, including Mount Rainier, Mount Saint Helens, ... Much of the landscape of the Columbia Plateau was formed from basalt, a dark volcanic rock.

The Grand Coulee Canyon is one of Washington state's most striking geological marvels. This large dry riverbed gorge runs for 50 miles through the Columbia Plateau — where America's oldest ...

A Columbia Plateau cactus, aka basalt cactus, pictured growing near Mitchell in eastern Oregon in 2021. This native Northwest cactus species could soon be the official cactus of Washington state ...