New Super Mario Bros. Wii: World 2 Location (Right of World 1)

World 2 is the second world on the map, located directly to the right of World 1.

• Complete World 1 Castle (defeat Bowser Jr.) → Path to World 2 unlocks.
• World 2 theme: Desert / Sand.
• Contains 5 levels + Tower + Castle + Airship.

No "cannon" unlocks World 2—it's the natural progression.