It is a small Phrygian fortress about 1.5 km north of İnlice locality of Ovacık village in Kütahya. Its central location on the mountain range (i. e. the "Long Range" of Haspels) that divides the mountainous Phrygia in half was very strategic for communicating with other fortresses by sign. Even the Midas Kale is visible from Deliktaş Kale.
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Berndt-Ersöz, S. 2006. Phrygian RockCut Shrines. Structure, Function and Cult Practice, Leiden.
Haspels, C. H. E. 1971. The Highlands of Phrygia. Sites and Monuments, Princeton.
Tüfekçi-Sivas, T. & Sivas, H. 2009. Frig Vadileri (Frigler'den Türk Dönemine Uzanan Miras), T. C. Eskişehir Valiliği, Eskişehir.
Tüfekçi-Sivas, T. 2012. 'Phrygian Valleys and Sacred Yazılıkaya-MidasCity', in Phrygians, In the Land of Midas, In the Shadow of Monuments, ed. by T. Tüfekçi-Sivas & H. Sivas, İstanbul.