Mastakh 2-y (Russian: Мастах 2-й, pronounced Mastakh Vtoroy) is a rural locality (a selo), and one of three settlements in Luchcheginsky 2-y Rural Okrug of Kobyaysky District in the Sakha Republic, Russia, in addition to Mastakh, the administrative center of the Rural Okrug and Byranattalakh.

It is located 282 kilometers (175 mi) from Sangar, the administrative center of the district and 3 kilometers (1.9 mi) from Mastakh.

Its population as of the 2002 Census was 23.

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