Lothlórien was a kingdom of Silvan Elves on the eastern side of the Hithaeglir. It was considered one of the most beautiful and "elvish" places in Middle-earth during the Third Age, and had the only mallorn-trees east of the sea.
Lothlórien stood between the south-eastern end of the Misty Mountains and the great river Anduin. The river Celebrant ran through the wood from its source in the mountains to the west through to the Anduin to the east. In its earlier days, the woods of Lothlórien extended south into Fangorn Forest. In these days there was no true border between the two territories, though after conversation between Treebeard and the King of the Golden Wood it was agreed that the inhabitants of either land could walk freely at their leisure across whatever borders there may be.[20] It is also possible that the woods of Lórien extended into the southern regions of Greenwood the Great, though there is only a small amount of evidence supporting this possibility. By the Third Age, Lórien was separate from Fangorn in the south and Mirkwood in the east by many miles.