Nusaybin is a municipality and district of Mardin Province, Turkey. Its area is 1,079 km², and its population is 115,586. The city is populated by …Nusaybin is a municipality and district of Mardin Province, Turkey. Its area is 1,079 km², and its population is 115,586. The city is populated by Kurds of different tribal affiliation. Nusaybin is separated from the larger Kurdish-majority city of Qamishli by the Syria–Turkey border.