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This mesmerising expanse shows a small stretch of the 153-kilometre-long Ivishak River in the US state of Alaska. The Ivishak flows north, through the Philip Smith Mountains and the foothills of the Arctic National Wildlife Refuge. It is a tributary of the Sagavanirktok River in the North Slope Borough at the top of Alaska. The borough’s largest city is Utqiaġvik, which is the northernmost settlement in the United States.
© Don Paulson/Danita Delimont