The Widow Harun
Toril is the planet on which the Forgotten Realms campaign setting take place. The continental landmass which includes Faerun, The Endless Waste, Kara-Tur, Zakhara, and The Utter East is the home and focus of the campaign area.
Toril is described in much more detail in the Forgotten Realms core books and supplements. Please consult these if you wish to learn more.