Taas Ürex
Taas Ürex, also known as the Tas-Yuryakh, joins the Olyokma from the left in the mountainous country north of the Stanovoy Range. Its upper basin reaches into some of the highest mountain massifs of the surrounding region. From these uplands the river descends toward the Olyokma, whose long course carries its waters north to the Lena through the forests of the Siberian interior.