A "nehir" is the Turkish word for "river." It refers to a natural watercourse that flows towards an ocean, sea, lake, or another river. Rivers are essential for ecosystems, providing habitats for various species and serving as a source of freshwater for human consumption, agriculture, and industry. In Turkey, several significant rivers, such as the Kızılırmak and Sakarya, play crucial roles in the country's geography and economy. These rivers are vital for irrigation, transportation, and hydroelectric power generation, contributing to the livelihoods of many communities along their banks.