Almaren as it might have been in the Beginning of Days.
As yet no flower had bloomed nor any bird had sung, for these things waited still their time in the bosom of Yavanna; but wealth there was of her imagining, and nowhere more rich than in the midmost parts of the Earth, where the light of both the Lamps met and blended. And there upon the Isle of Almaren in the Great Lake was the first dwelling of the Valar when all things were young, and new-made green was yet a marvel in the eyes of the makers; and they were long content. – The Silmarillion, Quenta Silmarillion. Chapter I Of the Beginning of Days
Therefore at that time they fortified their land anew, and they raised up the mountain-walls of the Pelóri to sheer and dreadful heights, east, north, and south. Their outer sides were dark and smooth, without foothold or ledge, and they fell in great precipices with faces hard as glass, and rose up to towers with crowns of white ice. – The Silmarllion. Quenta Silmarillion, Chapter XI Of the Sun and Moon and the Hiding of Valinor
And he laid him upon a mountain-top that looked from the north upon the hidden valley of Gondolin; and Turgon coming built a high cairn over his father. No Orc dared ever after to pass over the mount of Fingolfin or draw nigh his tomb, until the doom of Gondolin was come and treachery was born among his kin. – The Silmarillion, Quenta Silmarillion Chapter XVIII Of the Ruin of Beleriand and the Fall of Fingolfin