Lys (Dora Baltea)

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 / 45.88333°N 7.81111°E / 45.88333; 7.81111
• elevation	2,500 m (8,200 ft)
Mouth	Dora Baltea
• coordinates	45°35′24″N 7°47′33″E / 45.5900°N 7.7925°E / 45.5900; 7.7925
Length	40 km (25 mi)
Basin features
Progression	Dora Baltea→ Po→ Adriatic Sea

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

The Lys River originates from the Lys Glacier, located on the southern side of the Monte Rosa massif, at the foot of Vincent Pyramid (elevation: 4,215 metres / 13,829 ft). It flows through the Gressoney Valley, which is flanked by a road and passes through the following municipalities:

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

The Lys converges with the Dora Baltea (French: Doire baltée) as a right-bank tributary at Pont-Saint-Martin.

Its left-side tributaries include: Avant-Cir, Glassit, Loo, Mos, Niel, Pacoulla, and Tourrison. From the right, it receives: Rû de Nantay, Stolen, and Valbona.

The river is classified as a torrente, meaning a fast-flowing mountain stream typical of the Alps.

• 
  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
• 
  The river close to Issime
• 
  In Fontainemore
• 
  The Pont Saint-Martin
• 
  The river Lys in the Perloz municipality