...Manwe and Varda are seldom parted, and they remain in Valinor. Their halls are above the everlasting snow, upon the Oiolosse, the uttermost tower of Taniquetil, tallest of all the mountains upon Earth. When Manwe there ascends his throne and looks forth, if Varda is beside him, he sees further than all other eyes, through mist, and through darkness, and over the leagues of the Sea. And if Manwe is with her, Varda hears more clearly than all other ears the sound of voices that cry from the East to West, from the hills and the valleys, and from the dark places [of Middle-earth]...
The Silmarillion, Valaquenta