Dor-en-Ernil was a coastland region of southern Gondor. Its name is Sindarin for "Land of the Prince", a reference to the Princes of Dol Amroth. Its boundaries are not entirely clear: the maps in The Lord of the Rings seem to show it some miles to the east of Dol Amroth, separated from that headland by an unnamed range of hills. Given its connection to the Princes, though, it seems implausible that it would be disconnected from their citadel, so the placing of its label on the maps is probably no more than a convenience. The most likely interpretation seems to be that the land of Dor-en-Ernil ran from coast to coast between the mouths of the Ringló and the Gilrain, to the north of the wide cape of Belfalas.
The title Prince, as applied to the Númenórean Lords of Belfalas, pre-dates the use of the name Dol Amroth and so it is possible that these lands were referred to as belonging to 'the Prince' from as far back as the Second Age.
 Portrayal in adaptations
2014: The Lord of the Rings Online:
- Dor-en-Ernil was an area in the region of Central Gondor, located south of the Ringló Vale and west of Lower Lebennin. During the War of the Ring, it was attacked by Corsairs of Umbar and Haradrim. The fishing village of "Gaerlond" and the inland village of "Tungobel" were both burned, the lighthouse of "Barad Rill" was toppled, and the beacon "Dol Brannor" was seized by the Enemy. The river Gilrain and the city of Linhir formed the eastern border. The hills to the west, between Dor-en-Ernil and the Havens of Belfalas were mostly inaccessible but were identified in dialogue as the "Emyn Ernil".
- ↑ J.R.R. Tolkien, The Lord of the Rings, The Return of the King, "Map of Rohan, Gondor, and Mordor"
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The History of Galadriel and Celeborn", "Amroth and Nimrodel", note 14, p. 255
- ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "Cirion and Eorl and the Friendship of Gondor and Rohan", note 39, p. 316
- ↑ J.R.R. Tolkien, "The Rivers and Beacon-hills of Gondor" (edited by Carl F. Hostetter), in Vinyar Tengwar, Number 42, July 2001, p. 12