What is "buor-sysy"

Buor-Sysy is a rural locality (a selo), the only inhabited locality, and the administrative center of Indigirsky National Rural Okrug of Momsky District in the Sakha Republic, Russia, located from Khonuu, the administrative center of the district. Its population as of the 2010 Census was 387, of whom 198 were male and 189 female, down from 463 recorded during the 2002 Census.