The Silmarillion

In the north of the world Melkor had in the ages past reared Ered Engrin, the Iron Mountains, as a fence to his citadel of Utumno; and they stood upon the borders of the regions of everlasting cold, in a great curve from east to west. Behind the walls of Ered Engrin in the west, where they bent back northwards, Melkor built another fortress, as a defence against assault that might come from Valinor; and when he came back to Middle-earth, as has been told, he took up his abode in the endless dungeons of Angband, the Hells of Iron, for in the War of the Powers the Valar, in their haste to overthrow him in his great stronghold of Utumno, did not wholly destroy Angband nor search out all its deep places. Beneath Ered Engrin he made a great tunnel, which issued south of the mountains; and there he made a mighty gate. But above this gate, and behind it even to the mountains, he piled the thunderous towers of Thangorodrim, that were made of the ash and slag of his subterranean furnaces, and the vast refuse of his tunnellings. They were black and desolate and exceedingly lofty; and smoke issued from their tops, dark and foul upon the northern sky. Before the gates of Angband filth and desolation spread southward for many miles over the wide plain of Ard-galen; but after the coming of the Sun rich grass arose there, and while Angband was besieged and its gates shut there were green things even among the pits and broken rocks before the doors of hell.

To the west of Thangorodrim lay Hisilome, the Land of Mist, for so 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 Lomin, 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.

Fingolfin and Fingon his son held Hithlum, and the most part of Fingolfin's folk dwelt in Mithrim about the shores of the great lake; to Fingon was assigned Dor-lomin, that lay to the west of the Mountains of Mithrim. But their chief fortress was at Eithel Sirion in the east of Ered Wethrin, whence they kept watch upon Ard-galen; and their cavalry rode upon that plain even to the shadow of Thangorodrim, for from few their horses had increased swiftly, and the grass of Ard-galen was rich and green. Of those horses many of the sires came from Valinor, and they were given to Fingolfin by Maedhros in atonement of his losses, for they had been carried by ship to Losgar.

West of Dor-lomin, beyond the Echoing Mountains, which south of the Firth of Drengist marched inland, lay Nevrast, that signifies the Hither Shore in the Sindarin tongue. That name was given at first to all the coast-lands south of the Firth, but afterwards only to the land whose shores lay between Drengist and Mount Taras. There for many years was the realm of Turgon the wise, son of Fingolfin, bounded by the sea, and by Ered Lomin, and by the hills which continued the walls of Ered Wethrin westward, from Ivrin to Mount Taras, which stood upon a promontory. By some Nevrast was held to belong rather to Beleriand than to Hithlum, for it was a milder land, watered by the wet winds from the sea and sheltered from the cold north winds that blew over Hithlum. It was a hollow land, surrounded by mountains and great coast-cliffs higher than the plains behind, and no river flowed thence; and there was a great mere in the midst of Nevrast, with no certain shores, being encircled by wide marshes. Linaewen was the name of that mere, because of the multitude of birds that dwelt there, of such as love tall reeds and shallow pools. At the coming of the Noldor many of the Grey-elves lived in Nevrast near to the coasts, and especially about Mount Taras in the south-west; for to that place Ulmo and Osse had been wont to come in days of old. All that people took Turgon for their lord, and the mingling of the Noldor and the Sindar came to pass soonest there; and Turgon dwelt long in those halls that he named Vinyamar, under Mount Taras beside the sea.

South of Ard-galen the great highland named Dorthonion stretched for sixty leagues from west to east; great pine forests it bore, especially on its northern and western sides. By gentle slopes from the 'plain it rose to a bleak and lofty land, where lay many tarns at the feet of bare tors whose heads were higher than the peaks of Ered Wethrin; but southward where it looked towards Doriath it fell suddenly in dreadful precipices. From the northern slopes of Dorthonion Angrod and Aegnor, sons of Finarfin, looked out over the fields of Ard-galen, and were the vassals of their brother Finrod, lord of Nargothrond; their people were few, for the land was barren, and the great highlands behind were deemed to be a bulwark that Morgoth would not lightly seek to cross.

Between Dorthonion and the Shadowy Mountains there was a narrow vale, whose sheer walls were clad with pines; but the vale itself was green, for the River Sirion flowed through it, hastening towards Beleriand. Finrod held the Pass of Sirion, and upon the isle of Tol Sirion in the midst of the river he built a mighty watch-tower, Minas Tirith; but after Nargothrond was made he committed that fortress mostly to the keeping of Orodreth his brother.

Now the great and fair country of Beleriand lay on either side of the mighty river Sirion, renowned in song, which rose at Eithel Sirion and skirted the edge of Ard-galen ere he plunged through the pass, becoming ever fuller with the streams of the mountains. Thence he flowed south for one hundred and thirty leagues, gathering the waters of many tributaries, until with a mighty flood he reached his many mouths and sandy delta in the Bay of Balar. And following Sirion from north to south there lay upon the right hand m West Beleriand the Forest of Brethil between Sirion and Teiglin, and then the realm of Nargothrond, between Teiglin and Narog. And the River Narog rose in the falls of Ivrin in the southern face of Dor-lomin, and flowed some eighty leagues ere he joined Sirion in Nan-tathren, the Land of Willows. South of Nan-tathren was a region of meads filled with many flowers, where few folk dwelt; and beyond lay the marshes and isles of reed about the mouths of Sirion, and the sands of his delta empty of all living things save birds of the sea.

But the realm of Nargothrond extended also west of Narog to the River Nenning, that reached the sea at Eglarest; and Finrod became the overlord of all the Elves of Beleriand between Sirion and the sea, save only in the Falas. There dwelt those of the Sindar who still loved ships, and Cirdan the shipbuilder was their lord; but between Cirdan and Finrod there was friendship and alliance, and with the aid of the Noldor the havens of Brithombar and Eglarest were built anew. Behind their great walls they became fair towns and harbours with quays and piers of stone.