Ossiriand, or Land of Seven Rivers, was the most eastern region of Beleriand during the First Age, lying between the Blue Mountains and the river Gelion. Along the northern shore of the Ascar ran the Dwarf-Road to Nogrod.
The Seven Rivers were, from north to south:
- River Gelion
- River Ascar or Rathlóriel
- River Thalos
- River Legolin
- River Brilthor
- River Duilwen
- River Adurant
Ossiriand was a green and forested land, and it was not populated by the Sindar. In the early First Age before the rise of the Moon, a part of the Telerin elven people called Nandor entered Ossiriand under their leader King Denethor, and were given permission by Thingol to settle the lands.
Ossiriand was the only part of Beleriand that survived the War of Wrath, but Belegaer the Great Sea broke through the mountain chain at the former riverbed of Ascar, creating the Gulf of Lhûn. In the Second Age and Third Age the former lands of Ossiriand and Thargelion were known as Lindon, where Gil-galad the High King ruled.
|Elven Realms of Middle-earth throughout the Ages|
|Years of the Trees:||Cuiviénen | Eglador | Havens of the Falas|
|First Age:||Doriath | Dorthonion | Gondolin | Havens of Sirion | Havens of the Falas | Himlad & Pass of Aglon | Hithlum | Maglor's Gap | March of Maedhros | Nargothrond | Nevrast | Ossiriand | Pass of Sirion | Thargelion|
|Second Age:||Eregion | Greenwood the Great | Lindon | Rivendell|
|Third Age:||Lindon | Lothlórien | Northern Mirkwood | Rivendell|
|Fourth Age:||Lindon | Lothlórien & East Lórien | Rivendell | Wood of Greenleaves|