The Bowsarctica is World 5 in Super Mario Adventure. It is based on arctic regions like Greenland, Russia and the Polar circles. Among other things it sports a magnificent palace made of ice, a frozen cliffside covering a cavern full of lava, a long abandoned base in the middle of nowhere and a mysterious haunted house. It is the main base of Bowser until Bowsopolis is completed at the end of Bowser's Frozen Followers.