Not quite an adventure.

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The Mainland is the place where K'nuckles and Flapjack discover in the episode Lost at Land.It has many kinds of land,for example a vast desert,where Knuckles and Flapjack discover the Small People,a vast forest,where the two get to the desert and a forested coast,where they get off and find Bubbie and they find the monocle lens.It seems to cover the entire upper part of Earth when they get off Bubbie and then after it is zoomed out,the Moon says something like this "That ain't any island," possibly as a reference to Star Wars' "That's no moon!" line.