 The Valira del Nord is the northwest tributary, flowing from near El Serrat through the settlements of Les Salines, Arans, La Cortinada, Sornàs, Ordino, and La Massana — where it meets the Tristaina River — and eventually through Les Escaldes where it meets the Valira d'Orient forming the Gran Valira.The Valira d'Orient is the northeast tributary, flowing from near Grau Roig through Soldeu, Canillo, Encamp, and Les Escaldes where it meets the Madriu River and then the Valira del Nord, becoming the Gran Valira.There are also several much smaller drainage basins that span Andorra's borders with France and Spain.