Llobregat

The Llobregat is the second longest river in Catalonia, Spain, after the Ter. It flows into the Mediterranean south of the city of Barcelona. Its name could have originated in an ancient Latin word meaning 'dark', 'sorrowful' or 'muddy', or from Rubricatus, "red."
The Llobregat originates at an elevation of 1,259 metres in the Serra del Cadí, within the limits of Castellar de n'Hug municipality, Berguedà comarca. The total length of the river is over 170 kilometres .
At Martorell, the Roman Via Augusta crosses the river on the impressive Devil's bridge, which dates from the High Middle Ages in its current form. The C-16 highway is also known as the 'Llobregat Axis' for its largest stretch follows the valley of the Llobregat.

Wikipedia