The land where Frodo must destroy the One Ring in J.R.R. Tolkien’s The Lord of the Rings is Mordor.
Mordor is the realm ruled by Sauron in southeastern Middle-earth. Its landscape includes volcanic plains, fortified passes, and Mount Doom, the only place where the Ring can be destroyed. The Fellowship’s mission therefore requires Frodo and Sam to enter the enemy’s own territory rather than seek a safer distant refuge.
Mordor is bordered by major defensive ranges, including the Ephel Dúath and the Ered Lithui. The Black Gate provides a heavily guarded northern entrance, while Cirith Ungol offers another route, though it is protected by Shelob and orc forces. Frodo and Sam ultimately reach Mount Doom through this dangerous region.
Mordor is sometimes confused with Gondor because the two realms share a long frontier and a history of war. Gondor is a human kingdom opposing Sauron; Mordor is Sauron’s stronghold. The Ring is destroyed when Gollum falls into the volcanic fires of Mount Doom.