Sınırtepe (Kurdish: Aznavur; Syriac: Aznāwūr)[2][a] is a neighbourhood in the municipality and district of Nusaybin, Mardin Province in Turkey.

[1][5] Aznāwūr (today called Sınırtepe) was historically inhabited by Syriac Orthodox Assyrians.

[7] It was visited in 1840 by Reverend Horatio Southgate, who noted the village served as the residence of the local chief and that there were forty families, consisting of Syriac Orthodox Christians and Muslim Kurds.

[8] By 1880, however, the village was wholly inhabited by Syriac Orthodox Christians.

[9] In 1914, there were 350 Assyrians, according to the list presented to the Paris Peace Conference by the Assyro-Chaldean delegation.