Üçköy (Kurdish: Xarābê Alê;[2][a] Syriac: ܐܪܟܚ, romanized: Arkaḥ;[4][b] or Xarābāle)[2] is a neighbourhood in the municipality and district of Nusaybin, Mardin Province in Turkey.

[9] Arkaḥ (today called Üçköy) is mentioned in the Life of Malke, likely written in the ninth or tenth century, in which it is noted that Mor Malke resided near the village, where he performed several miracles and gained Šlémūn bar Wahbūn as a disciple.

[8] Arkaḥ was inhabited by adherents of the Church of the East until it was abandoned and eventually resettled by Syriac Orthodox Christians in the 1830s and the Church of Mor Ephraim and Mor Theodorus was rebuilt, however it was still in ruins when the village was visited by Gertrude Bell in 1909.

[12] In 1914, Arkaḥ was inhabited by 300 or 400 Assyrians, according to the list presented to the Paris Peace Conference by the Assyro-Chaldean delegation.

Unless otherwise stated, all figures are from the list provided in Eastern Christianity, Theological Reflection on Religion, Culture, and Politics in the Holy Land and Christian Encounter with Islam and the Muslim World, as noted in the bibliography below.