The Evermor Pass is used for trade between High Rock and Cyrodiil. During The Crossing War it was renamed the "Lion Gates" for the ambushes from the Lion Guard towards the Imperials. General Manti Pitus was killed in the pass. Same with his entire Legion.
The pass is near the city of Evermor getting the name Evermor Pass. The pass is surrounded by vast caynons in southern High rock.