The Arga-Yuryakh (; , ArÃÂaa ÃÂrex) is a river in Sakha Republic (Yakutia), Russia. It is one of the major tributaries of the Omoloy. The river has a length of and a drainage basin area of .
The river flows north of the Arctic Circle, across desolate tundra territories of the East Siberian Lowland. Its basin falls within Ust-Yansky and Bulunsky districts. The name of the river comes from the Yakut "ArÃÂaa-ürex" (ÃÂÃÂÃÂðð-ïÃÂÃÂà), meaning "western river".
The Arga-Yuryakh is a left tributary of the Omoloy. It has its sources at the confluence of the long Mundukan and the long Khadarynnya in the eastern slopes of the Orulgan Range of the Verkhoyansk Range system. The river flows roughly in an ENE direction and when it descends into the East Siberian Lowland, it bends and heads in a NNE direction until the end of its course. In its last stretch the river flows roughly parallel to the Omoloy further east, meandering in the floodplain. Finally the Arga-Yuryakh bends to the east and joins the left bank of the Omoloy from its mouth. The confluence is downstream of the mouth of the Kuranakh-Yuryakh.
The main tributaries of the Arga-Yuryakh are the long Ulakhan-Kieng-Appa on the right, as well as the long Turkulaakh, the long Tonguulaakh, the long Alyy-Yurege, the long Omukchaan, the long Yullyugen and the long Mas-Khayippyt on the left. The river is frozen between early October and early June. There are more than 1,500 lakes in its basin.