In the fiction of J.R.R. Tolkien, Lond Daer Enedh (also spelt Ened) was a great harbour in Eriador founded by the Númenóreans.

Lond Daer, under the name Vinyalondë, or 'New Haven', was founded by Númenor's crown prince Aldarion on the estuary of the river Gwathló in the early Second Age. It was the first permanent settlement of the Númenóreans in Middle-earth. From here Aldarion's "Guild Of Venturers" began harvesting the local timber for the ship-building industry of Númenor.

Within a few centuries, the deforestation of the outlying regions Enedwaith and Minhiriath became cataclysmic, angering the local native population (ancestors of the Dunlendings), and they began to fight back with increasing ferocity, destroying the haven several times, and frequently burning the great wood-stores in 'hit-and-run' attacks.

By the time of the War of the Elves and Sauron in the middle of the Second Age, this 'New Haven' was about a thousand years old, and had grown in importance, and so its name was shortened to Lond Daer, 'The Great Haven'. As such, it was one of the two beachheads of the Númenórean forces in Eriador that were used to support the Elves around S.A 1700.

Lond Daer's shipyards were starved of timber following the war, as the forces of Sauron had burnt almost all of what remained in Enedwaith and Minhiriath. Once its shipbuilding yards were no longer practicable, Lond Daer declined in importance, and the Númenorean hunger for ever more wealth shifted focus to the establishment of newer havens to the south, Pelargir and Umbar. Following this, Lond Daer was once again renamed, being now one of several major ports in Middle-earth, and was known as Lond Daer Enedh, or 'Great Middle Haven'. Despite this, Númenor still maintained traffic on the Gwathló as far as the city of Tharbad.

After the Downfall of Númenor, Elendil founded the realm of Arnor in the lands north of Lond Daer, but the haven was now redundant, and fell into ruin. Instead, control over the region was maintained from Tharbad. The ancient ruins of Lond Daer were still visible as late as the end of the Third Age, however, and still featured on maps from that time.