A representation on the map from The Lord of the Rings Online.
Nan Curunír (i.e. the "Valley of Saruman") was the name given to the southernmost valley of the Misty Mountains, at the foot of the mountain Methedras.
Nan Curunír was named in the Third Age and soon became the location of Isengard.
Etymology
The name 'Curunír' comes from the original name of the white wizard Saruman who settled there, so therefore 'Nan Curunír' meant 'Saruman's Vale' in Sindarin.
Nan Curunír in its desolate state in The Lord of the Rings Online