This valley is situated near Yeşilhisar in the province of Kayseri, 40km southeast of Ürgüp, and 25km to the east of Derinkuyu.
Fractures and collapses during earthquakes have added to erosion resulting in deep valleys as canyons. Soğanlı valley, which is divided into two, has been occupied since the Roman period. The rock cones found on the sides of the valley were used as graves by the Romans, and later as churches date back to the 9th and 13th centuries.
Important churchs in the valley are Karabaş, Yılanlı, Kubbeli and the church of St. Barbara (Tahtalı)