Kalınağaç is a neighborhood in Siverek District, in Şanlıurfa Province, Türkiye. Kalınağaç lies 10.6 km from the Malatya Dağları mountains. It has 797 inhabitants (2022). The nearest city is Siverek, 16.3 km to the east. Among the landmarks around are Gerger Castle (19.4 km), Hacıhıdır Dam (12.3 km) and Nissibi Bridge (18.0 km).