It is a level 55-60 dungeon situated in the Eastern Plaguelands zone of the game's map. This dungeon was finally added to the WoW Classic's Season of Discovery in Phase 4's addition to the game.

This page hosts all of the zone maps that you will be able to explore in World of Warcraft Classic, ... Eastern Plaguelands. Up Next: WoW Classic Profession Guide and Tips.

I get why you might want to go to the Plaguelands to round out your 1-60 adventure in WoW Classic. It’s filled with many undead, and some of the biggest, most interesting dungeons wait in this area.

The legendary WoW Expansion, Wrath of the Lich King, is returning within WoW Classic, raining the Scourge plague down upon all of Azeroth once more.