| Byoryolyokh | |
| Source1 Location: | Polousny Range |
| Mouth: | Indigirka |
| Mouth Coordinates: | 70.9853°N 149.0367°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Russia |
| Length: | 754km (469miles) |
| Basin Size: | 17000km2 |
| Pushpin Map: | Russia Sakha Republic |
| Pushpin Map Caption: | Location in Sakha, Russia |
The Byoryolyokh (Russian: Бёрёлёх,[1] Yakut: Бөрөлөөх|translit=Börölööx) is a river in Yakutia in Russia. It flows into the Russko-Ustyinskaya, a left distributary of the Indigirka.[1]
By the Byoryolyokh more than 8,000 bones from at least 140 woolly mammoths have been found in a single spot, apparently having been swept there by the current.[2]
The northernmost archaeological site of the Paleolithic Stone Age is located by the river at .[3]
The name of the river is based on the Yakut language Yakut: Бөрөлөөх|translit=Börölööx|label=none, meaning "teeming with wolves."[4]
The source of the Byoryolyokh is located at the confluence of two small rivers north of the Polousny Range. The river flows roughly northeastwards across the Yana-Indigirka Lowland. The length of the Byoryolyokh is 754km (469miles). The area of its drainage basin is 17000km2.The river is also known as "Yelon" (Russian: Елонь) in a section of its lower course. It joins the Indigirka from the left at the Russo-Ustinsky Canal, the western arm of the Indigirka River near its mouth, not far from Chokurdakh.[5]
The main tributaries of the Byoryolyokh are the Wese-Killah on the left; and the Ulakhan-Killah (Tiit), Selgannah and Ary-May on the right.[6]
There are more than nine thousand lakes in the basin of the Byoryolyokh River. It usually floods over its banks in July and August. In winter it freezes to the bottom.[6]