Largest cities
Teheran 8,694,000 pop., 13,382,000 urban aggl.
Mashhad 3,001,000 pop., 5,045,000 urban aggl.
Esfahan 1,961,000 pop., 2,425,000 urban aggl.
Ahvaz 1,185,000 pop., 1,500,000 urban aggl.
Highest mountains
Damavand 5,610 m (18,406 ft)
Longest rivers
Karkheh 900 km (559 mi)
Largest lakes
Caspian Sea 371,000 kmē (143,244 sq mi) total, shared with Russia, Kazakhstan, Turkmenistan and Azerbaijan
Lake Urmia 5,200 kmē (2,008 sq mi)
Namak Lake 1,800 kmē (695 sq mi)
Largest islands
Qeshm 1,491 kmē (576 sq mi)