CHUVASH REPUBLIC - Чувашская Республика — Чувашия / Чăваш Республики — Чăваш Ен

The Chuvash Republic (Russian: Чува́шская Респу́блика — Чува́шия, Chuváshskaya Respúblika — Chuváshiya; Chuvash: Чӑваш Республики, Čăvaš Respubliki), or Chuvashia (Russian: Чува́шия Chuváshiya; Chuvash: Чӑваш Ен, Čăvaš Jen), is a federal subject of Russia (a republic). It is the homeland of the Chuvash people, a Turkic ethnic group. Its capital is the city of Cheboksary. 

The Chuvash Republic is located in the center of European Russia, in the heart of the Volga-Vyatka economic region, mostly to the west of the Volga River, in the Volga Upland. It borders with the Mari El Republic in the north, Nizhny Novgorod Oblast in the west, the Republic of Mordovia in the southwest, Ulyanovsk Oblast in the south, and the Republic of Tatarstan in the east and southeast. There are over two thousand rivers in the republic—with the major ones being the Volga, the Sura, and the Tsivil—as well as four hundred lakes. Some of the Volga River valley reservoirs are in the north of the republic, and the Sura River flows towards the Volga along much of the republic's western boundary.

On May 15, 1917, the Chuvash joined the Idel-Ural Movement and in December 1917 joined the short-lived Idel-Ural State, when an agreement was reached with Tatar representatives to draw the eastern border of Chuvashia at the Sviyaga River. In 1918–1919, the Russian Civil War encompassed the area. This ended with victory for the Bolsheviks. To gain support from the local population, Lenin ordered the creation of a Chuvash state within the Russian SFSR. On June 24, 1920, the Chuvash Autonomous Oblast was formed, which was transformed into the Chuvash ASSR in April 1925.

Osteopetrosis affects 1 newborn out of every 20,000 to 250,000 worldwide, but the odds are much higher in the Russian region of Chuvashia (1 of every 3,500–4,000 newborns) due to genetic traits of the Chuvash people.

The covers posted by Diana from Cheboksary, the capital city of Chuvashia, on September 05, 2017 and I receivedon October 03, 2017. Unfortunately someone removed one of the stamps sticked on the right side of the envelope during transit.