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.
The castle of Sviyazhsk dates back to 1551 is situated at the island in Sviyaga Cove of the Kuybyshev Reservoir.
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