Abeir-Toril

Abeir-Toril is the name of the planet (and the crystal sphere) that the Forgotten Realms is set. It consists of various supercontinents and islands, including Faerûn, Kara-Tur, Zakhara, and Maztica.

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Toril was the name of Jeff Grubb's campaign world, which was adapted as the name of the planet Faerûn was set on when he and Ed Greenwood were designing the original Forgotten Realms Boxed Set in 1987. Abeir- was added as a prefix so that the world's name was placed at the beginning of an alphabetical encyclopedia.