Situated on a hillside at a point where the Karasu, flowing down from Kandilli Dağ, enters the Sakarya River, this small town was known in antiquity as Leukai and more recently as Lefke.

South of the town is a narrow and very beautiful river gorge with rocky walls up to 100 m/328 ft high, contributing to some spectacular scenery.

[5] In the west part of Osmaneli is the well-preserved ruins of a large Rum Orthodox church of the 1890s not far from it, a building that was used as a silk-spinning mill, and also the owner's house.

It is written in detail in those documents that the first structure had a basilica type crushed wooden roof, and following the privileges granted to Greek people as a result of Royal Edict of Reform, the current plan was implemented.

These towers, which can also be seen in early Byzantium era churches, have also been integral parts of Romanic, Gothic, and Baroque cathedrals in European architecture since the days of the Carolingian Empire.