Irdynsky swamp - a swamp in Cherkasy and Smelyansky districts of Cherkasy region of Ukraine . It is located between the valleys of the Tyasmin and Olshanka rivers, and stretches from the village of Moshny to the city of Smela .  From the swamp originate the river Irdyn and Irdynka , near its edge is the village of Irdyn . Peat is being developed on the territory of the swamp; a railway has been brought to the extraction sites.
|Ukrainian Irdinske swamp|
|Areas||Cherkasy district , Smelyansky district|
The Irdynsky swamp was formed on the site of the ancient arm of the Dnieper , which existed at least until the VIII century BC. e. The sleeve was separated from the main channel in the vicinity of the village of Sokirno, made a bend ( meander ) in place of the Irdynsky swamp, continued along the channel of the modern Tyasmin and merged with the main channel near Chigirin (the modern mouth of Tyasmin ).
Thus, an island existed between the sleeve and the main channel, which a number of historians identify with the island of Rus (Ros), described by Arab historians of the 7th century A.D. e.
In works dating back to the so-called “Anonymous geographical note” of the 9th century, Ibn Rust , Gardisi , Marvasi , Khudud al-Alam and others report that the Rus are different from the Slavs and live on the island, and their ruler is called a hakan.  .
“As for ar-Rusiyi, it is located on an island surrounded by a lake. The island on which they (the Russians) live, covering a three-day journey, is covered with forests and swamps, unhealthy and cheese to the point that only a person steps on the ground, as the latter shakes due to the abundance of moisture in it. They have a king called the Hakan of the Rus. They attack the Slavs, drive up to them on ships, land, pick them up, take them to Khazaran and Bulkar and sell them there. They do not have arable land, but feed only on what they bring from the land of the Slavs. ” 
Over time, the sleeve of the Dnieper swamped and ceased to exist, in its place the Irdynsky swamp formed.
Narrow gauge railway
- Irdynskoe swamp // Brockhaus and Efron Encyclopedic Dictionary : in 86 volumes (82 volumes and 4 additional). - SPb. , 1890-1907.
- See "Arab-Persian sources in Russia"
- Novoseltsev A.P. Eastern sources about the Eastern Slavs and Russia of the VI — IX centuries