Pelargir was the chief city of the region of Lebennin, built where the river Sirith joined with the Great River Anduin.

Pelargir was one of the oldest cities in Gondor, founded by the Faithful Númenóreans in the Second Age. During the Third Age, it was under continual threat from the Southrons and the Corsairs of Umbar.

During the War of the Ring, Pelargir was beseiged by the Black Ships of the Corsairs, but was liberated by Aragorn and the Dead Army.