Onguday

 village, district center

Onguday (Russian: Онгуда́й; Altay: Оҥдой, Oñdoy) is a rural locality (a selo) and the administrative center of Ongudaysky District in the Altai Republic, Russia, located on the Ursul River, 210 kilometers (130 mi) from Gorno-Altaysk, the capital of the republic. As of the 2010 Census, its population was 5,655, consisting mainly of the Altai people and Russians. Local name Ongdoy (from mongolian onge — "cave, cavity", doy — possession affix;literally — "having cave, cavities".
It was founded in 1626. In 1856-1857, the camp-settlement of the Altai spiritual mission of the Russian Orthodox Church was founded. In 1860, the first school was opened, for which a building was built in 1881. In 1879, the Assumption Church was built and consecrated in 1881. In 1908 the Church of St. Innocent of Irkutsk was built. In 1910, about 800 people lived in the village.