The Akhurian, Akhuriyan, Akhuryan or Akhouryan (Armenian: Ախուրյան Axuryan; Classical Armenian: Ախուրեան Axurean; Turkish: Arpaçay; Russian: Арпачай or Ахурян) is a river in the South Caucasus. It originates in Armenia and flows from Lake Arpi, along the border with Turkey, forming part of the geographic border between the two states, until it flows into the Aras River as a left tributary near Bagaran.