Cair Andros
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In The Lord of the Rings, Cair Andros is an island in the middle of the Anduin River. Its name means foaming water because the head of the island rises over a hundred feet in the air like a ship, causing the water to foam. It was also a Gondorian garrison at the height of Gondor but became a city island after the fall of the Barad-dûr in the Second Age.
During the Siege of Gondor, a small force was stationed at Cair Andros in a failed attempt to prevent Sauron from crossing. Aragorn later, on his march to the Morannon, sent a small group of soldiers who were afraid of assaulting Mordor to retake the island instead.
