Orodruin
Sam rescued Frodo from Orcs at the Tower of Cirith Ungol. The hobbits, followed by Gollum, reached Mount Doom, where Frodo was overcome by the Ring's power and claimed it for himself. At that moment, Gollum bit off his finger, taking back the Ring, but, gloating, he and the Ring fell into the fires of Mount Doom. The Ring and Sauron's power were destroyed.