The largest river of the Republic of Armenia is the Araks, which is on the country's border with Iran and a large part of the border with Turkey. Its major tributaries are the Akhurian, Kasagh, Hrazdan, Azat, Arpa, Vorotan and Voghdji rivers. The largest rivers in the northwest part of the country are the Debed and Aghstev. Smaller ones include the Dzoraget and the Pambak.