Faerûn

Faerûn is the largest out of the three continents on Toril, the other two being Kara-Tur and Maztica. Faerûn is a central supercontinent with diverse landscapes dominated by various races and cultures, and is the setting for most of the events to have transpired on Toril. During the creation of Abeir-Toril, the Underdark was created beneath the surface of what was to be Faerûn, and during the Rupture, when Abeir and Toril split apart, parts of the world's surface became so weak that they eventually caved in during the cataclysmic First Sundering of Faerûn, creating great chasms across the continent's surface.