The Widow Harun
Faerun is the western third of the largest continental landmass on the surface of Toril. East of Faerun, The Endless Waste leads to Kara-Tur. Zakhara is a peninsula connected to southeastern Faerun by a strip of land called The Utter East.
Faerun is described in much more detail in the Forgotten Realms core books and supplements. Please consult these if you wish to learn more.