Pyatigorsk is a city in Stavropol Krai, Russia, located on the Podkumok River, about 20 kilometers (12 mi) from the town of Mineralnye Vody, which has an international airport, and about 45 kilometers (28 mi) from Kislovodsk. Since January 19, 2010, it has been the administrative center of the North Caucasian Federal District of Russia. Population: 142,511 (2010 census); 140,559 (2002 census); 129…