It originates in the north-west of the
Chersky Range. The river flows southeastwards through the Moma-Selennyakh Depression which is bound in this area by the
Burkat and
Khadaranya ranges, and in the east by the
Selennyakh Range, then the river flows across the
Ust-Yansky District, where
Sayylyk, the only inhabited place of its basin is found. In its middle course the Selennyakh makes a wide bend northeastwards and then flows across the
Aby Lowland in a roughly eastern direction until it reaches the left bank of the Indigirka. The Selennyakh is frozen between October and May. According to the
State Water Register of Russia, it is a part of the
Lena basin district. The average annual discharge in the mouth is . ==References==