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Yuggoth is the Cthulhu Mythos name for planet Pluto, where the alien Mi-go are believed to have established a colony.
According to Ramsey Campbell's story The Mine on Yuggoth, this colony is a city set at the edge of a pit which is the dwelling place of an ancient entity of horrific appearance predating the colony's establishment, which even the Mi-Go fear. They periodically abandon the city at those regular occasions when it rises from the pit and can be seen directly.