9 of the world's most extreme lakes
Check out the biggest, deepest, saltiest and all-around strangest bodies of water Earth has to offer.
Double take lake
Taal Lake on the island of Luzon in the Philippines contains an island, which contains a lake, which contains another island — and the innermost lake on the island also holds the title of “largest lake on an island in a lake on an island.” Talk about mind-bending! This Wikipedia photo might help you wrap your brain around it all: