This building inside the walled area of Karadeniz Ereğli was put up by the Byzantines as the church of Hagia Sophia, the Holy Wisdom, and after it was turned into a mosque it came to be called Orhan Gazi, or the Middle Mosque.

It is in the Orhanlar quarter in the centre of Karadeniz Ereğli, five minutes' walk from the harbour and ten from the bus station.

Getting there

Access
In the Orhanlar quarter of central Karadeniz Ereğli, five minutes' walk from the port and ten from the bus station.Checked: September 15, 2026

When to go

Climate
Across Zonguldak as a whole, monthly mean temperatures run from 6.3 °C in January to 22.1 °C in August; the mean stays between 15 and 25 °C in May, June, July, August, September and October; rainfall is heaviest in December (154 mm) and lightest in May (55 mm). Long-term means for 1938-2025 from the Turkish State Meteorological Service (MGM).Checked: September 22, 2026