the direction of the ways flowing out of this lake (Estany de les Dugues) indicates that it drains to both sides of the Pyrenees. This seems unlikely and it is nowhere mentioned in Wikipedia. Someone with local knowledge can check whether it does indeed drain both to the Lac des Bouillouses (and then La Têt) and to the Estany Llat (and then Riu d'Angostrina), or change the direction of the ways accordingly