The Boven Merwede is a stretch of river in the Netherlands, mainly fed by the river Rhine. The Afgedamde Maas river joins the Waal at Woudrichem to form the Boven Merwede, which at Hardinxveld-Giessendam splits into the Beneden Merwede river on the right and the Nieuwe Merwede river on the left. Its length is 8.8 km.