Korozda

Korozda, also known as the Maze of Decay, surrounds the Golgari guildhall Svogthos on Ravnica. 
Korozda is an immense, circular maze of overgrown, fungus-encrusted ruins. It used to be the lair of guildmaster Jarad vod Savo and the place where he met with the Cilia, his irregular court of attendants. Korozda is patrolled by an array of swarming vermin, giant insects, kraul, zombies, and gleancrawlers. At its center is a great amphitheater, where the most important issues are brought to the Golgari's attention. 
Penvar, the Hanging Keep is a castle fixed upside down on the ceiling above the entrance of Korozda.James Wyatt and Jeremy Crawford (November 2018). "D&D Guildmasters' Guide to Ravnica", Wizards of the Coast.
During New Phyrexia's Invasion of the Multiverse, as part of Vraska's compleation of the Golgari, Realmbreaker upended Korozda from above, cracking Svogthos.
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