the.com/dam

A wall that tells a river to sit down and stay

means A barrier built across a river or stream to hold back water, raising its level or storing it for power, irrigation, or flood control.

from From Middle Dutch and Middle Low German 'dam,' a word that traveled into English through the watery, dike-building lowlands of the North Sea coast. It's a cousin of the same Germanic root behind 'Amsterdam' and 'Rotterdam' — towns literally named for the dams that tamed their rivers. The unrelated 'dam' meaning a mother animal is a separate word, a worn-down variant of 'dame.'

world's biggest
China's Three Gorges holds 39 trillion liters
slows time
Three Gorges water mass lengthened Earth's day
beaver built
One Canadian dam stretches over 850 meters
old habit
Romans built dams over 2,000 years ago
for instance

three gorges dam — world's largest hydroelectric dam by capacity, 22,500 mw, yangtze river china

hoover dam — iconic 726-foot concrete arch dam completed 1936 on colorado river, nevada-arizona border

itaipu dam — second largest hydroelectric capacity at 14,000 mw, shared by brazil and paraguay since 1984

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