What is "lochbach"

'''Lochbach (Itter) ''' is a river of North Rhine-Westphalia, Germany.

The origin of the Lochbach are a couple of sources near Solingen- Gräfrath and flows in Ohligs, another municipal district of Solingen, into the Itter.

The Lochbach valley is famous for 11 traditional water powered groundwood mills which are typical for the Country of Berg.