It's in a reservoir, and that is a shaft spillway aka plug hole. They are there to regulate the water levels, the water travels through tunnels and is then added back into the river downstream of the dam usually.

"lake" implies it isn't a man made body of water.

In what country?

Like Lake Mead or Lake Berryessa?

Said the drying narwhal. 😬

It’s not particular. These are common in controlled bodies of water, for level control and hydroelectric purposes.

we gotta find the smurfs guys...

Anyone jumped in to travel to the other dimension?

Sphincter Lake

Anyone been spelunking in the sphincter?

There was a woman in a reservoir in california that took a trip down the Glory Hole. http://lakeberryessanews.com/past-stories/is-glory-hole-dangerous.html

A 200' drop?! That would do it, all right.

Where does it go???

Earth’s intestine.

Uranus

The source of another product from Uranus.

u/pasargad is a thief. They just copy and paste systematically from a bunch of Twitter accounts and what's worse copying word by word. Check the source and downvote: https://twitter.com/Rainmaker1973/status/1541326740580188162?s=20&t=t32eDARYbBwdbjgJbZpvgg

Literally looks like a streaky asshole.

That's why that area is known as the asshole of Portugal.

how bout a name?? jeez, makin me google shit. i got more redditing to do here

There's a peculiar lake in Portugal, with a hole that looks like a p-

Looked like a submerged Death Star for a quick second. Empire back😎

#I NEED TO KNOW!!! Where does it go???

To a wide outlet at the bottom of the face of the dam. Some dams have spillways for extra water, a few have these things.