Arpachay (Eastern Arpachay) is a river in the Sharurdaralayaz uezd of the former Iravan governorate, later in the former Pashali (Azizbeyov, Vayk) district, and currently in the Vayots Dzor province. It rises in the Basarkechar mountain range and flows into the Araz River in the Sharur district of Nakhchivan. Its length is 126 km and the basin size is 2630 km². At present it is renamed “Arpi”.