|Other names||Northern Mirkwood[note 1]|
|Location||Various locations within Greenwood the Great (later called Mirkwood); by the end of the Third Age, they had settled in the far northeast of the Forest|
|Capital||The Elvenking's Halls from the early Third Age|
|Population||Elves of Mirkwood|
|Language||Silvan Elvish, Sindarin, Westron|
 Second Age
The Woodland Realm was established by Oropher in S.A. 750, a Sindarin Elf of Doriath, after the War of Wrath. Unlike most Sindar, Oropher and his household declined the Valar's offer to depart from Middle-earth for Valinor. Instead, he migrated eastward from Lindon and became the King of the Silvan Elves east of Anduin. The few Sindar who had come with him were soon merged with the Silvan Elves, adopting their customs and language and taking names of Silvan form and style. Oropher and his household wished to return to a simple existence natural to the Elves before they had been disturbed by the Valar.
Originally, Oropher's realm encompassed the south of Greenwood, with dwellings about the hill of Amon Lanc. However, throughout the Second Age, he and his people migrated north three times. According to one tradition, the first movement was northward beyond the Gladden Fields, due to Oropher's desire to distance himself from the increasing encroachments of the Dwarves of Khazad-dûm and his resentment of the intrusions of Celeborn and Galadriel in Lothlórien. However, his people did maintain constant intercourse with their kin west of the Anduin.
Oropher was also disturbed by the reports of Sauron's rising power and by the end of the Second Age, he dwelt in the western glens of the Emyn Duir and his numerous people lived and roamed in the woods and vales westward as far as Anduin, north of the ancient Dwarf-Road.
 Third Age
Around T.A. 1100, an evil entity known as the Necromancer (later identified as Sauron) had created a stronghold on Amon Lanc called Dol Guldur. As the Shadow fell upon Greenwood the Great, Thranduil's realm retreated before it as it spread ever northward, until at last, Thranduil established his realm in the north-east of the forest and delved there a fortress and great halls underground. His realm was also protected by the Enchanted River, which could cause one to sleep and dream deeply, whilst the Elvenking's Halls served as the chief fortress of the realm.
Thranduil's realm is said to have extended into the woods surrounding the Lonely Mountain and growing along the west shores of the Long Lake, before the coming of the Dwarves exiled from Moria and the invasion of the dragon Smaug. The Woodland Realm did trade with the neighbouring realms of Erebor and Dale, and imported wine from Dorwinion via the River Running. The former traffic came to an end upon with the destruction of Erebor by Smaug in T.A. 2770 but again resumed after the Battle of Five Armies.
In T.A. 2941, Thorin's band of Dwarves intruded in the Woodland Realm and were held prisoner in the Elvenking's Halls. Upon hearing the death of Smaug, Thranduil immediately assembled the army of the Woodland Realm and marched towards Erebor. In the ensuing Battle of Five Armies, many Wood-elves were slain  and many of the Orcs that survived wandered into the Woodland Realm were slain or lost in the trackless dark of Mirkwood.
On 20 June 3018 a force of Orcs attacked the Woodland Realm (orchestrated by Sauron), the purpose of this raid being to provide a distraction and facilitate the escape of Gollum who had been entrusted to Thranduil's care by the Ranger Aragorn.
In the wake of this, Thranduil sent his son, Legolas, to deliver news of Gollum's escape to Aragorn and Elrond in Rivendell. Upon arriving, Legolas participated in the Council of Elrond as an ambassador of the Woodland Realm where the full details of Sauron's resurgence were revealed.
Meanwhile, on 15 March 3019, Sauron's forces invaded the Woodland Realm in force and there was long battle under the trees and great ruin of fire; but in the end Thranduil had the victory. On the Elven New Year (6 April), he met Celeborn, Lord of Lórien, and the two agreed to rename the forest Eryn Lasgalen. Thranduil took the area from the northern eaves of the forest south to the Emyn Duir for the Woodland Realm.
 Later History
After the War of the Ring, the Silvan Elves of the Greenwood, including those of the Woodland Realm, remained untroubled. Many folk of the realm removed south to Gondor to restore the beauty of the South-kingdom, especially Minas Tirith and Ithilien.
The eventual fate of the Woodland Realm is unknown.
 Portrayal in adaptations
2018: The Lord of the Rings Online:
- Thranduil's realm is called Eryn Lasgalen and is accessible after the fall of Dol Guldur. In addition to "Felegoth", the Halls of the Elvenking, there is the Raft-elf settlement of "Loeglond" near the Long Lake; and the haunted ruins of "Caras Tilion", the former capital in the Mountains of Mirkwood. The quests in the area involve bringing stability to the realm so that trade may resume.
- ↑ Though geographically "Northern Mirkwood" might refer to a wide tract of the Forest, as a proper name it is always used as synonym for Thranduil's Woodland Realm in the northeast near to the Long Lake.
- ↑ 1.0 1.1 1.2 J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The Hunt for the Ring"
- ↑ 2.0 2.1 J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "The Council of Elrond"
- ↑ 3.0 3.1 J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth, "VI. The Tale of Years of the Second Age", p. 174
- ↑ J.R.R. Tolkien, The Lord of the Rings, The Return of the King, "The Ride of the Rohirrim"
- ↑ 5.0 5.1 5.2 5.3 J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The Disaster of the Gladden Fields", note 14
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The History of Galadriel and Celeborn", "Appendix B: The Sindarin Princes of the Silvan Elves"
- ↑ 7.0 7.1 7.2 J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Third Age"
- ↑ J.R.R. Tolkien, The Hobbit, "Queer Lodgings"
- ↑ 9.0 9.1 J.R.R. Tolkien, The Hobbit, "Flies and Spiders"
- ↑ J.R.R. Tolkien, The Hobbit, "The Last Stage"
- ↑ J.R.R. Tolkien, The Hobbit, "The Clouds Burst"
- ↑ J.R.R. Tolkien, The Hobbit, "The Return Journey"
- ↑ 13.0 13.1 13.2 J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Great Years"
- ↑ J.R.R. Tolkien, The Lord of the Rings, Appendix A, "Durin's Folk"
- ↑ J.R.R. Tolkien, The Lord of the Rings, The Return of the King, "Minas Tirith"