Kero Sewers

Kero Sewers is as the name implies is the sewer system of the Mushroom Kingdom in Super Mario RPG: Legend of the Seven Stars.

Kero Sewers is located above Midas Falls and is guarded by the dreaded dog monster Belome. Also for unknown reasons Kero Sewers is haunted by a variety of specters such as Boos, it also has a rat problem. Moreover, a tunnel in Land's End leads to the Kero Sewers, which Mario and his party enter to find -- among other things -- a jar of Cricket Jam, a Star, and many strange monsters on the way.