Mindolluin

Mindolluin or Mount Mindolluin was the easternmost peak of the Ered Nimrais (White Mountains), below and to the east of which stood the city of Minas Tirith.

Shortly after Aragorn's coronation as King Aragorn II, Gandalf took him by an ancient path into the foothills of Mindolluin, far above the city. There he discovered, upon an otherwise barren slope, a sapling of Nimloth, the White Tree of Gondor, which he planted in the Court of the Fountain as a sign of rebirth.

Etymology

Mindolluin is Sindarin for "towering blue head"; the double "l", as with all double letters in Sindarin, is pronounced as two separate letters rather than one.