Columbia subject headings:
Iran--Boundaries--Iraq.
Iraq--Boundaries--Iran.
Shatt al-Arab (Iraq and Iran)--International status.
Harvard subject headings:
Iran--Boundaries--Iraq.
Iraq--Boundaries--Iran.
Shatt al-Arab (Iraq and Iran)--International status.
Princeton subject headings:
Iran--Boundaries--Iraq.
Iraq--Boundaries--Iran.
Shatt al-Arab (Iraq and Iran)--International status.