[...] in the great fief of Belfalas, dwelt Prince Imrahil in his castle of Dol Amroth by the sea, and he was of high blood, and his folk also, tall men and proud with sea-grey eyes.
”
–The Return of the King, Minas Tirith
Dor-en-Ernil (Sindarin for "Land of the Prince") is a tributary kingdom of Gondor and home to the Swan Knights. The mighty city and port of Dol Amroth is situated within these lands.
Similarly to Rohan, Dor-en-ernil is a great place for a fortress or base to due to the uncanny amounts of extremely powerful mounted mobs.
Upon entering this biome, the player earns the achievement "Land of the Prince".
Dor-en-Ernil Hills
This region of Dor-en-Ernil is more mountainous, with more expanses of open plains.
Variants
Oak Shrubland: Normal Dor-en-Ernil biome with small oak scrubs all over the ground.
Light Forest: A slightly forested variant of Dor-en-Ernil.
Forest: A variant filled with trees of different types, but most are oak.
Dead Oak Forest: Dor-en-Ernil with many leafless oak trees.
Forest Hills: A hilly variant of Dor-en-Ernil with trees spawning everywhere, though there are not as many as in Dor-en-Ernil Forests.
Hills: A hilly variant of Dor-en-Ernil.
Flowers - A version of Dor-en-Ernil with an abundance of flowers.
Steppe - A very flat version of Dor-en-Ernil.
Barren Steppe - A steppe, but with no trees. Structures generate here very commonly.
Mountain - A mountain that rises from the surrounding terrain.
Mobs
Dor-en-Ernil is populated with Swan Knights both on foot and on horseback. Mordor Orcs have a chance of spawning at night, although less than in the rest of Gondor. Dor-en-Ernil is also home to swans around water sources.
Swan Knight - Knights from Dol Amroth who are far superior to the average Soldier.
Dol Amroth Captain - Traders who will let you hire Swan Knights.
Mordor Orc- Orcs of Mordor who are armed and ready to crush the free peoples.
Mordor Orc Archer- Mordor Orcs with bows.
Mordor Orc Bombardier- Mordor Orcs with deadly Orc bombs.
Swan - Large waterfowl (that can bite).
Structures
The main structure, and the only specific Dol Amroth structure that spawns in Dor-en-Ernil is the Dol Amroth stable, each of which will contain a Dol Amroth captain. These buildings tend to spawn in the plains.
Dol Amroth Stable - Structure with horses, Dol Amroth Crafting Tables, and a Dol Amroth Captain.
Gondor Ruins- Scattered ruins of some unrecognizable structure
Gondor Obelisk- Slim tower with a Beacon of Gondor on top
Vegetation
Dor-en-Ernil's environment is green and flourishing, with abundant flower and grass variants. Forests contain predominately oak, birch, and cedar trees. The grass is also greener here than in most other biomes.
Athelas has a fairly small chance to spawn here, as with the rest of Gondor.
The Men of Gondor 
