In the fiction of J. R. R. Tolkien, the Bay of Eldamar is the greatest bay in Aman. Eldamar means Elvenhome in Quenya. When the Ñoldor and Vanyar came to Aman this is where they landed. Later when the Teleri came, Ossë begged Ulmo to set Tol Eressëa in the Bay of Eldamar and Ulmo did this. But when the Ñoldor longed to see their kin again, Manwë comanded Osse to teach the Teleri the art of ship-making, and grievously he did this. Then the Teleri built the ships and with the help of the swans, they came to Aman. And there on the bay of Eldamar they built their new home Alqualondë, the port of swans.
An age before, the Ñoldor and the Vanyar made there home in Eldamar. The Valar brought down a small section of the Pelori and raised the hill of Tuna, on that hill the Ñoldor with the aid of Aulë built the city of Tirion the Fair. And through this opening in the mountains the light of Calacirya spread out and filled the Bay of Eldamar. When the Ñoldor wrought gems they also spread them throughout the great land.
The size of Eldamar is unknown, but the area between the Bay of Eldamar and the Pelóri was probably at least a few dozen miles wide; Eldamar also consisted of the shore of Taniquetil and the Calacirya where Tirion was built.
The city of the Teleri, on the north shore of the Bay is Alqualondë, or Haven of the Swans, whose halls and mansions are made of pearl.
In the bay is Tol Eressëa, which was an island at one time adrift, until Ulmo rooted it in the bay.
Tolkien, the Bay of Eldamar is the greatest bay in Aman.
And there on the bay of Eldamar they built their new home Alqualondë, the port of swans.
The Valar brought down a small section of the Pelóri and raised the hill of Túna, on that hill the Noldor, with the aid of Aulë, built the city of Tirion the Fair.