Shedaklah

Zuggtmoy’s principal lair is her palace on Shedaklah. It consists of two dozen mushrooms of pale yellow and rancid brown. These massive fungi are some of the largest in existence. They are surrounded by a field of acidic puffballs and poisonous vapors. The mushrooms themselves are all interconnected by bridges of shelf-fungi, and countless chambers have been hollowed out from within their rubbery, fibrous stalks. (https://www.dndbeyond.com/monsters/zuggtmoy)
Zuggtmoy ruled the 222nd layer of the Abyss, officially called Shedaklah, although according to her creator Gary Gygax, it was called Mycorji. She shared this layer with Juiblex, the Faceless Lord. Also called the Slime Pits, Shedaklah was a duo-layer: its surface was overrun by fungi and plant creatures while its underground corollary was infested with oozes and slimes. Zuggtmoy claimed the surface realm, whereas Juiblex was confined to below ground.
Zuggtmoy ruled from the center of the layer in a palace that consists of two dozen or so gigantic mushrooms, each connected to the others by shelf-fungi, and each four miles tall. Numerous chambers and corridors have been carved within the mushrooms; it was said not even Zuggtmoy herself knew the full extent of the palace. (https://greyhawk.fandom.com/wiki/Zuggtmoy)

Alternative Name(s)

Mycorji

Type

Dimensional plane

Location under

The Abyss

Owner/Ruler

Zuggtmoy

Ruling/Owning Rank

Demon Lord