Estanys de Baiau is a pair of lakes in Catalonia, Spain approximately 1 kilometre from the border with Andorra. The lakes are surrounded by several notable Pyrenean mountains, including Pic de Baiau and Coma Pedrosa—the highest mountain in Andorra—to the east, and Pic de Sanfonts to the south. They are both drained by Riu de Baiau, a tributary of the Barranc d'Arcalís.