In order to fulfil their promise, they diverted two rivers that drained the melted snow from the western Himalayas: the Amu Darya and the Syr Darya.

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Fast-forward several centuries, and a city was founded, then called Muang Sua, the result of two sages seeing a flame tree rising from the point where the rivers meet.

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In 2011, 45, 000 residents were evacuated from the city of Koblenz, situated on the Rhine and Moselle rivers, as bomb squads dealt with two bombs and a military fog-producing device that were dropped by American and British warplanes in the last years of the war.

CNN: Experts defuse unexploded WWII bomb in central Berlin