Mertropolis
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File:Mertropolis.JPG
Mertropolis.
Mertropolis is an underwater city protected by an oxygen-containing dome featured in the The Adventures of Super Mario Bros. 3 episode, The Ugly Mermaid. Bowser planned to take over the city using his Doomsub, renaming it "Kooptropolis", but his plans were foiled by the Mario Bros, who used a group of Jelectros against his submarine.
Notable residents of Mertropolis include its ruler King Mackerel and his daughter Holly Mackerel.
The town's name comes from a portmanteau of the words "mermaid" (or possibly "merman") and "metropolis", a word for a big city.