Aldarion had a great hunger for timber desiring to make Númenor into a great naval power; his felling of trees in Númenor had caused great dissensions. In voyages down the coasts he saw with wonder the great forests, and he chose the estuary of the Gwathló for the site of a new haven entirely under Númenórean control [...] There he began great works, that continued to be extended after his days.
- The Unfinished Tales, Appendix D
Located on estuary of the river Gwathló, Lond Daer was the first Númenórean colony on the shores of Middle-earth. Founded by S.A. 800, it served as an important port, especially for transporting lumber from Middle-earth to Númenor.
Largely ruined by the Downfall of Númenor and the subsequent reshaping of the shores of Middle-earth, Lond Daer was soon abandoned in favor of Tharbad in the early Third Age. By the end of the Third Age, the site of Lond Daer was mostly covered by estuarine salt marshes, with only a few islands and low hills indicating where this once-mighty city stood.