Khapchagay (; , XapçaÃÂay) is a rural locality (a selo), the only inhabited locality, and the administrative center of Doydunsky Rural Okrug of Megino-Kangalassky District in the Sakha Republic, Russia, located from Mayya, the administrative center of the district. Its population as of the 2010 Census was 132, down from 133 recorded during the 2002 Census.