The Maze is a region of the Underdark, composed of a massive number of artificial tunnels, structured similar to a maze.

Traps powered by underground rivers and/or magic are quite common.

These tunnels are inhabited by common dungeon-dwellers, as well as Minotaurs that have learned to navigate the tunnels.

The minotaurs have a city under Shadow Reef named Sanctuary.

The section under Minos is the Time Maze, a dangerous area filled with temporally distorted tunnels.