northwest territories, canada; algae in the river

Aerial view of a river cutting through a valley in the Brooks Range; Alaska, United States of America

Aerial view of a river cutting through a valley in the Brooks Range; Alaska, United States of America

Aerial View Of Rainbow And Virginia Falls, One Of Canada's Largest Waterfalls, Nahanni National Park, Northwest Territories

Aerial View Of Glacial Creek Flowing Into Green Waters Of Glacier Lake, Nahanni National Park, Northwest Territories

Aerial view of a river cutting through a valley in the Brooks Range; Alaska, United States of America

Scimitar Canyon, Nahanni National Park; Northwest Territories, Canada

The Trout River flows over whittaker Falls; Northwest Territories, Canada

Aerial view of snow-capped peaks surrounding a green river valley, Aleutian Range, Alaska Peninsula, Southwestern Alaska, USA, Summer

Aerial view of snow-capped peaks surrounding a green river valley, Aleutian Range, Alaska Peninsula, Southwestern Alaska, USA, Summer

The South Nahanni river flows through 'The Sluice Box' above Virginia Falls, Nahanni National Park Reserve; Northwest Territories, Canada

Grizzly Bear Standing On The Banks Of The South Nahanni River, Nahanni National Park, Northwest Territories

Aerial View Of The Nahanni River Valley, Northwest Territories