Lys (Dora Baltea)
| Lys | |
|---|---|
 The torrente Lys at Gressoney-Saint-Jean, Valle d'Aosta, Italy | |
| Origin | Monte Rosa |
| Mouth | Dora Baltea |
| Basin countries | Italy |
| Length | 40 km (25 mi) |
| Source elevation | 2,500 m (8,200 ft) |
The Lys is a small 40 kilometres (25 mi) river (classified as a torrente) which flows from the Lys glacier on the Monte Rosa massif, at the foot of Vincent Pyramid, elevation 4,215 metres (13,829 ft), 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 Avant-Cir, Glassit, Loo, Mos, Niel, Pacoulla, and Tourrison. From the right it receives: Rû de Nantay, Stolen and Valbona.