The Falathrim (S. ‘Coast people’; also called the Elves of the Falas and the Elves of the Havens) were the Sindarin Elves living in the Falas of Beleriand during the First Age. They had originated as Teleri, persuaded by Ossë to stay in Middle-earth while their kin embarked on the Great Journey to Valinor; throughout the Wars of Beleriand, their numbers were swelled by Sindar and Noldor.
The first mariners and shipwrights of Middle-earth, their lord was Círdan, under whose leadership they prospered for many years. They built all of the ships sailed by Men or Elves of Beleriand in the First Age, and sent a force to fight with the Union of Maedhros.
During the first and second battles of the Wars of Beleriand, however, Falas was invaded by Orcs of Morgoth, and the Falathrim were forced to withdraw to their walled Havens of the Falas. In 474, Falas was overrun, and the surviving Falathrim relocated to the Isle of Balar and continued building ships to aid the Men and Elves of Arvernien.