Morgul Vale
From Tolkien Gateway
Morgul Vale (Imlad Morgul in Sindarin), was the valley of the Morgulduin River in the western Mountains of Shadow. At its outflow into Ithilien stood the fortress of Minas Morgul ("Tower of Dark Sorcery"). The name was only used in the later Third Age, after the Nazgûl captured the fortress of Minas Ithil and turned it into the Tower of Dark Sorcery.