What is "mostonga"

The Mostonga ( Serbian Cyrillic: Мостонга) is a river in northern Serbia, in Bačka region of the province of Vojvodina, a 70-km long left tributary to the Danube. Once 92 km long, due to the extensive corrections and channeling of the river to make it part of the other canals, the Mostonga is shortened, turned into a series of channels and popularly referred to as a river there is no more.