Ortaca (Kurdish: Heşterek; Syriac: Eshtrākō)[2][a] is a neighbourhood in the municipality and district of Midyat, Mardin Province in Turkey.

[7] The Church of Mar Addai at Eshtrākō (today called Ortaca) has been dated to the first century AD.

[9] The monk Musa of Eshtrākō is named amongst those who were killed in the Cave of Ibn Siqi by the soldiers of Timur in 1394.

[10] In 1454 (AG 1765), many men from the village were suffocated to death by smoke by Turks of the clan of Hasan Beg, as per the account of the priest Addai of Basibrina in c. 1500 appended to the Chronography of Bar Hebraeus.

[14] Amidst the Sayfo, on 3 July 1915, most of the village's Assyrian population was massacred by their Kurdish neighbours and only twelve survivors managed to get to Hah.