Dereyanı is a neighborhood in Yeşilli District, in Mardin Province, Türkiye. Dereyanı lies 6.0 km from the Mardin High mountains. It has 783 inhabitants (2022). The nearest city is Yalım, 15.8 km to the southwest. Among the landmarks around are Mor Hananyo Monastery (15.4 km), Zerzevan Castle (38 km) and Mardin Museum (16.8 km).
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