Ignimbrite exposed in river canyons cut since 1912 eruption, in the Valley of Ten Thousand Smokes, in Katmai Volcano National Park, Alaska, United States of America, North America

travel erosion eroded rock cliffs cliffs surface processes physical geography topography natural world nature north america united states of america usa alaska national parks katmai volcano national park katmai volcano valley of ten thousand smokes ignimbrite rivers river canyons scenics landscapes landscape vertical outdoors day contemporary photography