River Urskoy

The Urskoy is the river that makes the fields of Kislev fruitful and allows Kislevite ships to be built in the capital. It is a mighty river, which joins the Reik at Altdorf. The barges of Kislev use this river to navigate through the Empire where exotic wares like vodka and the famous Kislevite duelling pistols fetch a good price. In the middle of the river Urskoy stands a lonely cliff, covered only by wild moss and lichen, that juts out to astonishing heights. The only person ever to reach its remote summit is the Cossack leader Stepan Rasin. Today, the cliff bears his name and when the waves of the Urskoy speak to one another at night, they are sure to mention Ataman (Cossack Chief) Stepan Rasin, the great hero of Kislev.

Source
Río Urskoy
 * Warhammer Fantasy RPG 1st ED -- Kislev: The claw of the Great Bear
 * pg. 8
 * pg. 9