In the middle of the Monticello Dam in Lake Berryessa, Northern California, US,

The Glory Hole

In the middle of the Monticello Dam in Lake Berryessa, Northern California, US, there's a massive drain hole. It's called the Morning Glory Spillway, but has also earned the affectionate nickname "The Glory Hole".
At 22 metres in diameter, the hole sucks in water from the dam to prevent flooding at a rate of 1300 cubic metres per second when it reaches capacity.

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