Ages ago, in times few remembered, the Dark Lord, Sauron, fashioned Rings of Power in his land of Mordor. One he made for himself, and it was the mightiest, for it could control the others. In all, twenty rings were made.

The Elves were not tricked by Sauron's false friendship, so they hid their rings. Sauron has taken back the seven of the Dwarves. The nine are used by the Black Riders, the Nazgul, who are Sauron's powerful servants. But the One was lost.

Lost, that is, until now. The One has been found, by the "good guys", fortunately, for if Sauron recovers it he will be invincible!

Being a mighty warrior and hero of the land, you are summoned to a council of the wise and the leaders of the free peoples. The leader of the council, Elrond Half-Elven, after a long debate about what to do with the ring, says, "There is only one way. We must destroy it. Doing that will destroy Sauron. It must be thrown into the Mountain of Fire, Orodruin (also called the Mountain of Doom). However, Mount Doom lies in the land of Mordor — where Sauron dwells."

You volunteer to be the ringbearer. You must go through a mountain pass called Cirith Ungol and into Mordor. There you will throw the ring into the fire of the mountain.

You journey south until you reach the jungle-forest of southern Ithilien.

Details at Eamon Wiki