Kassa was a town of ancient Bithynia. Its name does not occur in ancient authors but is inferred from

epigraphic Epigraphy () is the study of inscriptions, or epigraphs, as writing; it is the science of identifying graphemes, clarifying their meanings, classifying their uses according to dates and cultural contexts, and drawing conclusions about the wr ...

and other evidence. Its site is located near

Sapanca Sapanca is a town and district in the Sakarya Province in the Marmara region of Turkey near Lake Sapanca. The town's mayor is Özcan ÖZEN ( AKP). Sapanca has recently become a tourist destination, due to its stunning natural environment and it ...

in Asiatic Turkey.

References

Populated places in Bithynia Former populated places in Turkey History of Sakarya Province {{Sakarya-geo-stub