This is the Unknownhole, a mysterious wormhole type that defies explanation. Its entrance is hidden behind a waterfall, and its exit leads to a dimension of pure chaos.
Little is known about this wormhole, except that it's not to be trifled with. Those who have ventured into the Unknownhole have never returned, or so the rumors go.
If you're feeling brave, you can attempt to enter the Unknownhole, but don't say we didn't warn you.