Başçeşme is a neighborhood in Bigadiç District, in Balıkesir Province, Türkiye. Başçeşme lies at 222 m above sea level, 6.2 km from the Anatolian plateau mountains. It has 265 inhabitants. The nearest city is Balıkesir, 19.6 km to the northwest. Among the landmarks around are Zagan Pasha Mosque (19.6 km), İkizcetepeler Dam (2.9 km) and Çamköy Dam (17.0 km).