The Kinzig is a river approximately 86 kilometers long. It rises in Sterbfritz, flows southwest through the Main-Kinzig district of Hesse, and flows into the Main from the right in Hanau. The Kinzig is a second-order river in low mountain ranges. It overcomes an elevation of 301 meters and has a bed gradient of 3.5 per thousand. The Kinzig's catchment area covers 1,058 square kilometers, and the calculated mean discharge (MQ) at the mouth of the Kinzig is 10.97 cubic meters per second.
The Kinzig was first documented in 796 as "iuxta fluvium Kincihen." In 815, the name was written as "Chinzicha," around 900 as "Kincicha"/"Kinzicham," in 1364 as "Kinzige," in 1584 as "Kintzig," in 1607 as "Bintz," in 1681 as "Kintz," in 1716 as "Kins," in 1769 as "Kinzing," and in 1802 as "Kinzig." In the river's headwaters, there was the now-defunct village of Kinzig, mentioned in 815 as "Chirizichheimero." The village and river were often confused by monastery scribes at that time with "Chizzicha" (now Bad Kissingen), both of which were described as being located in the Saalegau.
The name presumably derives from the ancient Celtic *ku̯anti̯o- meaning "flat hill, valley." The name was therefore derived from the mountainous region from which the Kinzig flows.
Source: Wikipedia