The Lys is a small 40 km river (classified as a torrente) which flows from the Lys glacier on the Monte Rosa massif, at the foot of Vincent-Pyramide (4215 m), and runs through the Lys Valley, flanked by a road, before converging with the Dora Baltea as a right tributary at Pont-Saint-Martin.
Its left-side tributaries are Torrente Avan-cir, Torrente Giassit, Torrente Loo, Torrente di Mos, Torrente Niel, Torrente Pacoulla, and Torrente Tourrison. From the right it receives: Rio di Nantay, Torrente Stolen and Torrente Valbona.
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