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High upon the Tower Hills stood three tall Elven towers, the White Towers, the highest of which was called Elostirion and held a Palantír. The towers were built before the end of the Second Age by Gil-galad as a gift for Elendil.
In the early Fourth Age, Elanor daughter of Samwise Gamgee and her husband Fastred moved to the Tower Hills, founding the town of Undertowers on the eastern slopes of the Hills, and becoming the Wardens of Westmarch, when the Tower Hills became the new western border of the Shire.
Portrayal in Adaptations
The Towers Hills are one of the battlegrounds in this game. The White Towers can be seen at the background of the map.