Başüstü is a village in Afşin District, in Kahramanmaraş Province, Türkiye. Başüstü lies at 1,398 m above sea level, 0.7 km from the Binboğa mountains. The nearest city is Afşin, 6.0 km to the east. Among the landmarks around are Eshab-ı Kehf Kulliye (0.9 km), Adatepe Dam (17.9 km) and Great Mosque of Afşin (6.1 km).