The Lys (Walser German: Liisu or Lyesu) is a small 40 kilometres (25 mi) river (classified as a torrente).

This article does not cite any sources. (August 2017)

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Lys
The Lys at Gressoney-Saint-Jean
Location
Country	Italy
Physical characteristics
Source
• location	Monte Rosa
• coordinates	45°53′00″N 7°48′40″E
• elevation	2,500 m (8,200 ft)
Mouth	Dora Baltea
• coordinates	45.5900°N 7.7925°E / 45.5900; 7.7925
Length	40 km (25 mi)
Basin features
Progression	Dora Baltea→ Po→ Adriatic Sea

Close

It flows from the Lys Glacier on the south side of the Monte Rosa massif, at the foot of Vincent Pyramid, elevation 4,215 metres (13,829 ft), and runs through the Gressoney Valley, flanked by a road, through the following municipalities:

• Gressoney-La-Trinité
• Gressoney-Saint-Jean
• Gaby
• Issime
• Fontainemore
• Lillianes
• Perloz

It converges with the Dora Baltea (fr. Doire baltée) 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.

• The sources of the Lys at the Lys glacier in the Monte Rosa mountain massif, below the Vincent Pyramid and close to the giant Lyskamm (4.533 m)
• The river close to Gaby in the Aosta Valley
• The Roman bridge of Pont-Saint-Martin
• In Fontainemore

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