The Empty Quarter is a pass location in Torchlight II, Act II that connects Zeryphesh to the Salt Barrens.
The only pass in Act II, it contains the Undercurrents dungeon, and becomes accessible after the player defeats the Artificer in the Forsaken Vaults and speaks with the Guardian of Air in Zeryphesh. It is a desert area filled with large buildings and ruins.
Contrary to its name, the Empty Quarter is not really empty, but contains several rather easy monsters: Ratlin, Sandrats (spawning infinitely from Sandrat Nests) with a few Amarex and Basilisks mixed in.
The only friendly NPC in the pass is Dilawar, a Zeraphi commando who waits near the entry point to the Undercurrents and offers the side quest The Brave Ones.