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A whitewater river rafting boat belonging to Canyoneers, Inc. cruises slowly through a smooth water section of Marble Canyon, in Grand Canyon National Park.
In this photo, we can see how the Colorado River is a desert river in Grand Canyon. The riparian area, which is the transition zone between the river and the surrounding desert land, is very narrow here. It's a thin strip of green along the river.
Photo location: Marble Canyon, Grand Canyon National Park, Arizona