Pelargir was a great harbour city in southern Gondor.
Pelargir was one of the oldest cities in Gondor, founded by the Faithful Númenóreans in the year 2350 of the Second Age. During the Third Age, it was under continual threat from the Southrons and the Corsairs of Umbar.
During the Kin-strife, the rebel followers of Castamir retreated there after his death, led by his sons. At Pelargir they fought a lengthy siege against the rightful King of Gondor, before fleeing to the Haven of Umbar.