The pass above Minas Morgul in J.R.R. Tolkien’s The Lord of the Rings is Cirith Ungol.
Cirith Ungol means “Spider’s Cleft” in Tolkien’s invented languages. Frodo and Sam take this perilous route toward Mordor after Gollum leads them away from the main road and toward the lair of Shelob.
The pass is guarded by a fortress also called the Tower of Cirith Ungol. After Shelob attacks Frodo, Sam believes his companion is dead, takes the Ring temporarily, and enters the tower to rescue him from Orcs.
Cirith Ungol should not be confused with the mountain pass of Caradhras, which the Fellowship attempts to cross before entering Moria. Minas Morgul itself is the city in the valley below Cirith Ungol, not the name of the pass.