|Location||Northern Blue Mountains|
|Description||A large mountain|
The land around the mountain belonged to Caranthir, who built a fortress on its western slopes. The fortress was destroyed during Dagor Bragollach. Elven forces probably withdrew from the area after the battle, and most definitely after Nirnaeth Arnoediad. After the War of Wrath, Rerir was apparently heavily damaged, and from the Second Age onward it was but only a shadow of its former size.
Rerir is a name in an unknown language, and of an unknown meaning.