Azov-Black Sea Krai (Russian: Азово-Черноморский край, romanized: Azovo-Chernomorskiy kray) was an early krai of the Russian SFSR of the Soviet Union. Its capital was Rostov-on-Don.
It was formed on 10 January 1934 out of the North Caucasus Krai. According to the 1937 All-Union Census, it had population of 5,601,759.
North Caucasus Krai (Russian: Се́веро-Кавка́зский край, Severo-Kavkazskiy kray) was an administrative division (krai) within the Russian Soviet Federative Socialist Republic of the Soviet Union. It was established on 17 October 1924. Its administrative center was Rostov-on-Don until 10 January 1934, Pyatigorsk until January 1936, then Ordzhonikidze (today Vladikavkaz) and, from 15 December 1936, Voroshilovsk (today Stavropol).
As of 1932, the population of the krai was estimated at 10,290,000 in an area of 351,800 km. 45.9% of the overall population was Russian, and 37.2% of the overall population was Ukrainian.
View the full Wikipedia page for North Caucasus Krai