Crissaegrim

In J. R. R. Tolkien's fictional universe of Middle-earth, the Crissaegrim were home to the great Eagles of Thorondor.

The Crissaegrim formed a part of the southern Echoriath, the Encircling Mountains of Gondolin.

It was here that Thorondor, Lord of the Eagles lived, and from here he watched for spies in the vale of the River Sirion.

Its name is Sindarin for "cleft mountain peaks", but in Tolkien's stories it is usually referred to as the "Eagles' Cleft" or "Abode of Eagles" because the peaks were inaccessible from the ground.