World 3 (Super Mario World 2: Yoshi's Island)
From the Super Mario Wiki
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 extra level is Extra 3: More Monkey Madness; its secret level is Secret 3: Go! Go! Morphing!. 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.