Başıbüyük is a neighborhood in Maltepe District, in Istanbul Province, Türkiye. Başıbüyük lies 6.2 km from the Akçakoca Dağları mountains. It has 21,951 inhabitants (2022). The nearest city is Fındıklı, 2.1 km to the northwest. Beaches nearby: Bostanci Halk Plaji (5.4 km), Caddebostan (6.8 km), Caddebostan (7.7 km). Among the landmarks around are Hagia Sophia (15.3 km), Blue Mosque (15.5 km) and Süleymaniye Mosque (16.9 km). Among the natural features are Çamlıca Hill (10.3 km) and Galatasaray Islet (14.5 km).