World 7 (Super Mario 3D Land)
From the Super Mario Wiki
World 7 is the seventh world traveled to in Super Mario 3D Land. The setting of this world is a jungle-like area. The overworld's background is covered in purple haze and many trees, both big and small are spread throughout the background. World 7 contains 6 levels and a Toad House. Boom Boom and Pom Pom are both fought together in the airship at the end.