It is therefore in the canton of Valais, and it would naturally drain into the river Rhône in the valley below. However a dam has been constructed to enable its use as a reservoir, increasing its size and raising its level by .
The place is situated within the canton of Valais, where it would typically flow into the Rhône River at a lower elevation. Nonetheless, a dam has been built to harness its potential as a reservoir, increasing its volume and height by .