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The Vilayet of Constantinople or Istanbul was a vilayet of the Ottoman Empire.
It was known as the jurisdiction of the Zabtiyeh Ndziri, and had a special organisation, as it was placed under the immediate authority of the Minister of Police, who filled a role equivalent to the wali in other vilayets.
It included Istanbul and the quarters of Eyüp, Kassim Pacha, Pera and Galata, and all the suburbs from Silivri on the Sea of Marmara to the Black Sea on the European side, and from Ghili on the Black Sea to the end of the Gulf of İzmit on the Asiatic side.
In 1878, a provincial structure, with a governor (wāli) and provincial officers, was established to perform the same functions within Istanbul that provincial authorities performed elsewhere in the Empire.
Sanjaks and kazas, circa 1877: