Yeşilırmak, also known as the Halys River, is the longest river in Turkey, stretching approximately 519 kilometers. It originates from the Eastern Anatolia region and flows through several provinces, including Sivas and Tokat, before emptying into the Black Sea. The river plays a crucial role in the local ecosystem and agriculture, providing water for irrigation. The river is significant in history, having been mentioned in ancient texts and serving as a natural boundary in various empires. Its basin supports diverse wildlife and is vital for the communities along its banks, contributing to both their livelihoods and cultural heritage.