Eregion.
Hollin.
Eregion, the country between Hithaeglir to the east, Bruinen, Rhudaur and the Angle to the north and north-west and Sirannon and Glanduin to the south.
In the north were the boundary the two wells of Bruinen ( One named Merrill. ) coming out of Hithaeglir near Rivendell, this river was running 240 miles south-east, halfway meeting the waters of Hoarwell, and further down named Mitheithel which was also the boundry of Eregion to the north-west.
The boundary in the south to Dunland was river Glanduin coming from its well near the peak of Celebdil in Hithaeglir and running 200 miles west to marshes of Nîn-in-Eilph and the outflow into Mitheithel.
To the east was Hithaeglir the natural boundary and barrier.
Most of Eregion were highland and moors and basically all of the northern area were never populated. The northern Eregion was an rough, folded and wild land, where the wind blew cold from the mountains upon the thorn-bushes that grew in great thickets in that part of the land and path were little known except to the people of Rivendell.
About in the middle of the country, right between north and south-Eregion was the land divided by Hollin-Ridge and it was south and south-west of this ridge, more accurate, at river Glanduin just before Nîn-in-Eilph the Elves, lead by Galadriel and Celeborn, established the city Ost-in-Edhil and the realm Eregion in the Second age year 750.
In this realm became Celebrimbor the most famous
of the Elvensmiths but the realm was laid waste by Sauron
in S.A.1697. In the east of Eregion in the mountains of Hithaeglir a little north of Glanduin but in front of its
tributary Sirannon was the West Gate, the Doors
of Durin, to Moria and above these deep Dwarven-mines raised Caradhras,
Celebdil and Fanuidhol their peaks into the sky and between
those peaks ran the trail of the Redhorn Pass.