What is "terbyas"

Terbyas is a rural locality (a selo), the only inhabited locality, and the administrative center of Tylgyninsky Rural Okrug of Vilyuysky District in the Sakha Republic, Russia, located from Vilyuysk, the administrative center of the district. Its population as of the 2010 Census was 644, of whom 300 were male and 344 female, down from 710 as recorded during the 2002 Census.