The N'Fiss rises on the eastern flank of Djebel Tichka and first flows eastward. At the bottom of the Tizi N'Test path it obliquely toward the northeast. R 203 road that descends from the path to Marrakech borrows its valley, across the country Goundafa, the kasbah of Goundafa dominate the headwaters of Ijoukak. After Ouirgane and dam, while the R 203 continues north-east, N'Fiss moves northward through gorges and feeds the dam of Takerkoust. Beyond the dam, it opens in the Haouz plain and slightly oblique, and more significantly, to the north-west. After being crossed by the road from Marrakech to Agadir and Essaouira (N 8), followed by the A7 motorway, he joined the Tensift.
Extract from Wikipedia N'Fiss