[youtube =http://www.youtube.com/watch?v=kpRRkXnRc0E]

Located in Oregon’s Mount Hood National Forest, the Lost Lake presents a highly unusual natural phenomenon; each winter the lake bed fills with water from nearby streams, and every spring it drains—rather like a bathtub—down a large hole. Jude McHugh, spokeswoman for the Willamette National Forest, told The Bulletin that the hole has been there for as long as anyone remembers, and that the mysterious phenomenon is most likely the result of the regions porous volcanic landscape—the hole itself is believed to be an open lava tube. As for exactly where the Lost Lake’s waters go each spring, no one is entirely sure, but it’s thought that it seeps into the subsurface where it recharges nearby aquifers.

Via Treehugger

Image screengrab via YouTube