There are two rivers named Ourthe - The Eastern (Ourthe Oriental) and Western (Outhe Occidental); close from where these two meetm a dam is build to control the flow downstream (to prevent flooding and damage) and produce electricity. Today's wal lead us from Grande Mormont. over the rolling hills to Filkly and from there to the confluence of the two rivers, with a sidestep to the Barrage de Nisramont, over a ridge bove the forest. The way to this ridge was mainly over the rolling hills, but the way back followed the Ourthe Oriental back to our starting point.