Places in Middle-earth
Three Elf-towers of immemorial age were still to be seen on the Tower Hills beyond the western marches [of the Shire]. They shone far off in the moonlight. The tallest was furthest away, standing alone upon a green mound. The Hobbits of the Westfarthing said that one could see the Sea from the top of that tower; but no Hobbit had ever been known to climb it.
The Lord of the Rings, Prologue, Concerning Hobbits
It is said that the towers of Emyn Beraid... were raised by Gil-galad for Elendil, his friend; and the Seeing Stone of Emyn Beraid was set in Elostirion, the tallest of the towers. Thither Elendil would repair, and thence he would gaze out over the sundering seas, when the yearning of exile was upon him; and it is believed that thus he would at whiles see far away even the Tower of Avallónë upon Eressëa....
The Silmarillion, Of the Rings of Power and the Third Age
The only Stone left in the North was the one in the Tower on Emyn Beraid that looks toward the Gulf of Lune. That was guarded by the Elves, and... it remained there, until Círdan put it aboard Elrond's ship when he left....
The Lord of the Rings, Appendix A, Annals of the Kings and Rulers: Eriador, Arnor, and the Heirs of Isildur, Footnote
Contributors: Elena Tiriel 7Jul06