World 3 is a world in the game Super Mario World 2: Yoshi's Island and its remake Yoshi's Island: Super Mario Advance 3. It is a jungle-based level. Its mid-boss is Prince Froggy; its main boss is Naval Piranha. Its secret level is Go! Go! Morphing!, its extra level is More Monkey Madness, and its bonus level is Drawing Lots. Although almost all the levels are jungle themed, there is one level titled The Cave of Harry Hedgehog, which takes place in a cave.
It may be assumed that the jungle is the same one crossed in Yoshi's Story. The game gives two possibilities to the jungle's name: Piranha Grove, or Neuron Jungle.