Topkaya is a neighborhood in Mut District, in Mersin Province, Türkiye. Topkaya lies at 580 m above sea level, in the Western Taurus mountains. It has 130 inhabitants. The nearest city is Mut, 37 km to the southeast. Among the landmarks around are Alahan Monastery (25 km), Tarḫuntašša (7.3 km) and Philadelphia (24 km). Among the natural features are Sertavul Pass (17.6 km).