The Kızılırmak (Turkish: Kızılırmak, "Red River"), also known as the Halys River (Ancient Greek: Ἅλυς), is the longest river in Turkey among the rivers which originates and ends in Turkey (both origin and mouth being in Turkey). It is a source of hydroelectric power and is not used for navigation. (http://en.wikipedia.org/wiki/K%C4%B1z%C4%B1l%C4%B1rmak_River)
The Aras (also known as Araks, Arax, Araxi, Araxes, Araz, or Yeraskh; Armenian: Արաքս or Երասխ (Araqs or Erasx), Azerbaijani: Araz, Persian: ارس (Aras), Turkish: Aras, Kurdish: Aras or Erez; Russian: Аракс; Latin: Aboras), is a river located in and along the countries of Turkey, Armenia, Azerbaijan, and Iran. (http://en.wikipedia.org/wiki/Aras_River)