 Another state that "bolaq" is an Old Tatar/Bulgar for "brook" and could be found in several modern hydronyms of Tatarstan.Bolaq, as a part of Qaban lake system once was a part of Volga's riverbed, but then Volga came some kilometers to the west.By the results of geological and hydrological researches nearby thousand years ago Bolaq was a natural river, wide and deep.