From there, the river flows generally into the north-west direction, along the Šumadija's geological bar into which the river carved its epigenetic valley and formed a watershed. The valley of Topčiderka is a natural route for the Belgrade-Niš railway.
Subsequently, the river moves in a northwest direction, following the Šumadija's geological ridge, where it has carved out an epigenetic valley and established a watershed. The Topčiderka valley provides a natural path for the Belgrade-Niš railway.