A high hill that rose at the southern extent of the range known as Emyn Muil, on the western side of the Great River Anduin. It overlooked the wide lake of Nen Hithoel, where Anduin gathered its waters before plunging over the Falls of Rauros and continuing its southward course. The hill had bare and gentle slopes rising out of the woods that ran along the shores of the lake at its feet.

After the founding of Gondor, probably early in the history of that land,¹ the Gondorians chose the hill to be the site of the Seat of Seeing, a place that granted a wide view over the northern ranges of their land. It was from this Seat of Seeing that the hill gained the name of the Hill of the Eye or the Hill of Sight, Amon Hen in Elvish. It had a counterpart across the Great River, rising in the eastern Emyn Muil, which was known as Amon Lhaw, the Hill of Hearing.

As history progressed, the power and extent of Gondor lessened, and the Seat of Seeing on the Hill of the Eye was left untended. At the end of the Third Age, the Fellowship of the Ring came to the foot of the hill as they journeyed southward down Anduin. Frodo Baggins found his way to the high Seat on the hill, and from there looked out across Middle-earth, seeing war kindling across all the lands. He was wearing the Ring at this time, and he came close to discovery by the Dark Lord, but escaped. Considering the danger and the lure of the Ring, he resolved to depart from the Fellowship and complete the Quest of Mount Doom alone.

Aragorn, too, sought out the Seat to see what he could discover. It was as he made his way up the Hill of the Eye, accompanied by Samwise Gamgee, that Sam realised what Frodo's plan must be. Sam was able to catch his master Frodo before he set out across the Great River, and thus the two companions left the Hill of the Eye behind as they began their final desperate journey into the Black Land of Mordor. Elsewhere on the slopes of the hill, Boromir was slain by Orcs, who then carried away Merry and Pippin. The survivors of the broken Fellowship set Boromir's body in a funeral boat before departing the Hill of the Eye themselves to pursue the Orcs far across the fields of Rohan.