Mr Poudel said even the heart of Pokhara faces the threat in the wake of the changes in the river's waterway.

BBC: Nepal floods change river course and threaten tourism

Once inside, the steely gray of the river changes to a rich gold, as the boat threads into a channel walled with reeds.

NPR: Iraq's Marshlands Face A Second Death By Drought

Heraclitus, ancient Greek poet and philosopher, viewed reality as dynamic: when we dip our foot into a river, the river itself changes to some degree.

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Nadav Kander's images of China's Yangtze River depict communities adjusting to the changes caused by the re-routing of the country's largest river.

CNN: Photos capture plundering of Earth's resources

But nowhere are the changes more apparent than along the Chagres River itself, dammed in 1913 to form Gatun Lake, as part of the Panama Canal project.

BBC: In search of pirates in Panama

These changes have been particularly evident to Inuit hunters of Clyde River in Nunavut (Canada) since the 1990s.

UNESCO: Weathering uncertainty in the Arctic

About two months after the offering, the Tianjin city government suspended trading in "Roaring Yellow River" and another painting, and the exchange imposed limits on daily and monthly price changes.

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