The Gök River or Gökırmak ( Turkish for "Sky River") is a tributary of the Kızılırmak in Turkey. In the past it was called Amnias (). Its source is in

Kastamonu Province Kastamonu Province () is a Provinces of Turkey, province of Turkey, in the Black Sea Region, Turkey, Black Sea region in the north of the country. It is surrounded by Sinop Province, Sinop to the east, Bartın Province, Bartın, Karabük Province ...

. It may have been known to the Hittites as the Sariya. It was a holy river in the ancient country of Paphlagonia. The Battle of the River Amnias was fought in 89 BC between Mithradates VI of Pontus and

Nicomedes IV of Bithynia Nicomedes IV Philopator () was the king of Bithynia from c. 94 BC to 74 BC. (''numbered as III. not IV.'') He was the first son and successor of Nicomedes III of Bithynia. Life Memnon of Heraclea wrote that Nicomedes IV was the son of Nicomedes ...

during the

First Mithridatic War The First Mithridatic War /ˌmɪθrəˈdædɪk/ (89–85 BC) was a war challenging the Roman Republic's expanding empire and rule over the Greek world. In this conflict, the Kingdom of Pontus and many Greek cities rebelling against Roman rule ...

References

Rivers of Turkey Landforms of Kastamonu Province {{Kastamonu-geo-stub