The Vazúza is a short stream crossing the borders of the provinces of Tver and Smolensk, meeting a great bend of the Vólga at Zubtsóv (in the province of Tver).

The Sea of Khvalýnsk is the Caspian, so called from an ancient people (the Khvalísi) of the eleventh and tenth centuries, who lived at the mouth of the Vólga in the Caspian. There is also a town called Khvalýnsk on the Vólga in the province of Sarátov, above the city of Sarátov.

This particular story is probably a poetization of a geographical fact, but in all the Russian folklore the river-gods play a very great part. Thus Igor in The Word of Igor’s Armament, on the occasion of his defeat, has a very beautiful colloquy with the Donéts. At least two of the heroes of the ballad cycle, Don Ivánovich and Sukhán Odikhmántevich, are in some aspects direct personifications of the rivers, whilst the river-gods exercise a direct and vital influence over the fortunes of several others, such as Vasíli Buslávich and Dobrýnya Nikítich.