TheKatun (Russian:Катунь[kɐˈtunʲ];Altay:Кадын,romanized: Qadın[qɑˈdɯn]) is a river in theAltai Republic and theAltai Krai ofRussia. It forms theOb as it joins theBiya some 19 kilometres (12 mi) southwest ofBiysk.[3] The Katun is 688 kilometres (428 mi) long, and itsdrainage basin covers 60,900 square kilometres (23,500 mi2).[4] It originates in the Katunglaciers on the southwestern slope ofBelukha Mountain. The river freezes up in late November or early December and breaks up in early or mid-April. The main tributaries of the Katun are, from source to mouth:Koksa (left), Kucherla (right),Argut (right),Chuya (right),Ursul (left), Sema (left) and Isha (right). The river is navigable.
The Katun in the Altai Republic
In its upper reach of the Katun flows down the distant and sparsely populated area, but a few kilometers downstream near the villageKuyus, the coastal population density grows steadily and the area downstream of the villageUst-Sema is the most populated. There are numerous buildings, holiday camps and various guest houses in the pine forest near the village. The main settlements along the Katun are, from source to mouth:Ust-Koksa,Katanda,Inya,Chemal,Manzherok,Souzga,Aya,Mayma,Srostki andVerkh-Katunskoye.