Hithlum - "To the west of Thangorodrim lay Hísilómë, the Land of Mist, for it was named by the Noldor in their own tongue because of the clouds that Morgoth sent thither during their first encampment; Hithlum it became in the tongue of the Sindar that dwelt in those regions.  It was a fair land while the Siege of Angband lasted, although its air was cool and winter there was cold.  In the west it was bounded by Ered Lómin, the Echoing Mountains that marched near the sea; and in the east and south by the great curve of Ered Wethrin, the Shadowy Mountains, that looked across Ard-galen and the Vale of Sirion." ~The Silmarillion, chap. 14 (Of Beleriand and its Realms)