Gap of Nurza Shûk

The Gap of Nurza Shûk was the south opening in Mordor of the Plateau of Gorgoroth, lying west of Nargroth and east of the made-up fortress of Morigost, or, in between the Maegond and Mithram Spurs.

Through this passage comes one road, a road which south of the passage forks into three roads connecting to the harbors of the Sea of Nurnen.

This location does not originate from any map created by Tolkien himself.

External reference

 * www.thelandofshadow.com/ragath-dur-ancient-map-of-mordor/