Sea of Rhûn

Also called the Inland Sea is located in eastern Middle-earth. The Sea of Rhûn was a large inland sea located in Rhûn, a land east of Mirkwood and north of Mordor. The River Running from the Lonely Mountain flowed into the Sea of Rhun.

There were mountains on the southwest side of the sea and a forest on the northeast side. Wild white kine lived near it's shores. The Great Horn of Gondor was made from the horn of one of these kine that had been hunted by Vorondil, a Steward of Gondor.

When Gondor was at the height of its power during the reign of King Hyarmendacil (1015-1149), the realm extended east as far as the Sea of Rhun. But as Gondor's power waned, Easterlings came into the area around the Sea of Rhun and launched attacks on Gondor. In 1248, Minalcar (later called Romendacil) defeated an army of Easterlings between Rhovanion and the Sea of Rhun and destroyed their settlements. In 1944, an army of Wainriders gathered on the southern shores of the Sea of Rhun before launching an assault on Gondor that left King Ondoher dead.

During the War of the Ring, forces under the rule of Sauron mustered in the lands beyond the Sea of Rhun. After the downfall of Sauron, Aragorn, King Elessar, and King Eomer rode beyond the Sea of Rhun to flush out the last remnants of the enemy forces.