Martuni, is a town in the Martuni Municipality of the Gegharkunik Province of Armenia, located on the southern shores of Lake Sevan. As of the …Martuni, is a town in the Martuni Municipality of the Gegharkunik Province of Armenia, located on the southern shores of Lake Sevan. As of the 2011 census, the town had a population of 12,894. As per the 2016 official estimate the population of Martuni is around 11,200.