The Pinnath Gelin (Sindarin pinnath "ridges" + celin "green") was an upland region in the far west of Gondor, bounded to the west by the River Lefnui, and to the east by the Morthond. It lay behind the long shore known as Anfalas or Langstrand. The name is translated 'Green Hills' (not to be confused with the Green Hills that ran through the Shire, far to the north of Pinnath Gelin).
At the time of the War of the Ring, the lord of this region was Hirluin the Fair. He led three hundred of his soldiers to the defence of Minas Tirith, all dressed in green, as seems to have been the custom among the hills of Pinnath Gelin. Hirluin never went back to the Green Hills of his home - he was slain in the Battle of the Pelennor Fields.