The Halys River, known in modern times as the Kızılırmak, is the longest river in Turkey, stretching approximately 1,355 kilometers. It originates in the Eastern Anatolia region and flows through central Turkey before emptying into the Black Sea. The river has played a significant role in the history and agriculture of the region, providing water for irrigation and supporting various settlements along its banks. Historically, the Halys River was significant in ancient times, serving as a natural boundary between various civilizations, including the Lydians and the Persians. It is also mentioned in classical texts, including those by the Greek historian Herodotus. The river's fertile valley has been crucial for agriculture, contributing to the development of the surrounding areas.