Silvan elf realm east of the Hithaeglir (Misty Mountains) where the rivers Celebrant (Silverlode) and Anduin (The Great River) meet. It was established sometime in the First Age and called Lórinand.
During the Second Age, Lórinand was ruled by Amdír up until his untimely death during the Battle of Dagorlad before the Morannon of Mordor. Afterwards, his son Amroth took up rule until in TA 1981 he was lost at sea while searching for his love, the elf maiden, Nimrodel.
Sometime after the loss of Amroth, Celeborn and Galadriel came from Harlond in the west and took over rule of Lórinand. The Sivan elves then took up the language of Sindarin which was spoken by their new Lord and Lady. Lórinand was then known as Lórien or Lothlórien.
One of Lothlórien's most notable features are the mellyrn, the tall golden trees. A mallorn (plural mellyrn) is the tallest living tree in Middle-earth. It has grey to silver bark and golden blossoms. In the autumn, the leaves of the mellyrn turn gold and do not fall off until the spring when new leaves emerge. The elves of Lothlórien were known as the Galadhrim (Tree-people) because they built and lived on talain (tree-platforms) up in the mighty mallyrn
The chief city of Lothlórien was Caras Galadhon and it is from there that Celeborn and Galadriel ruled up until their departures during the Fourth Age.