Rivers run underground all over the world. These occur naturally in cave
systems, and have been known since antiquity. But this is about
subterranean rivers that were once open to the sunlight and were buried
by human hands (or heavy machinery). This happens when cities are built
overtop, when wetlands are drained, and when existing waterways are
consolidated and hidden to give people and their infrastructures more
room to grow or move. In some of those places, people don't even realize
there's a river running underneath their homes. Read about some of these rivers in
an article I wrote for mental_floss.
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