Treaty of Zuhab
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The Treaty of Zuhab (or the Peace of Qasr-e-Shirin) was an accord signed between Safavid Persia and the Ottoman Empire on May 17, 1639. This accord ended 150 years of intermittent wars between the two states over territorial disputes. It divided territories in the Middle East by granting Yerevan in the southern Caucasus to Iran and all of Mesopotamia (including Baghdad) to the Ottomans.
Nevertheless, border disputes between Persia and the Ottoman Empire did not end. Between 1555 and 1918, Persia and the Ottomans signed no less than 18 treaties that would re-address their disputed borders. The exact demarcation according to this treaty would not begin until the 19th century, essentially laying out the rough outline for the frontier between modern day Iran and what became the state of Iraq.