Aksu, literally meaning the white river, formerly known as Yermak, is a city in Pavlodar Region, Kazakhstan. The population of the municipal areā¦Aksu, literally meaning the white river, formerly known as Yermak, is a city in Pavlodar Region, Kazakhstan. The population of the municipal area is 67,665 ; 73,165. and the population of the town 41,677 ; 42,264.