Les Trois Vallées (French pronunciation: [le tʁwɑ vale]; "The Three Valleys") is a ski region in the Tarentaise Valley in the Savoie department of Southeastern France, to the south of the town of Moûtiers, partly in Vanoise National Park.

Since 1971, it has been possible to ski the interlinked valleys using a single ski pass. Thus, Les Trois Vallées is the largest connected ski area in the world which is linked solely by ski lifts and slopes. It claims to have about 600 km (370 mi) of ski slopes, resulting in 18.5 km² of groomed runs, while an independent expert measured about 493 km. In addition, there are 120 km for cross-country skiing. Les Trois Vallées has 183 ski lifts, which can transport 260,000 skiers per hour. Other equipment owned by the operating companies include 2,300 snow cannons and 73 snow grooming machines operated by 160 snow groomers who work in shifts during the night. Other employees in the area include 424 ski patrollers and 3,000 ski instructors.

As implied by its name, the area originally consisted of three valleys: Saint-Bon, Allues, and Belleville. The skiing area has since been extended into a 'fourth' valley, the Maurienne valley. It is adjacent to Val Thorens, but can also be accessed using a long gondola lift from Orelle. The following ski resorts are in Les Trois Vallées:

Valley	Resort	Established	Skiable range (m)	Sub-resorts
Saint-Bon	Courchevel	1946	1300 - 2738	Courchevel-Le Praz, Courchevel-Village (1550), Courchevel-Moriond (1650), Courchevel 1850
Saint-Bon	la Tania	1990	1400–2305	-
Allues	Méribel	1939	1400–2952	Meribel-Village, Meribel, Meribel-Mottaret
Allues	Brides-les-Bains	1992	600–1450	Les Allues
Belleville	Val Thorens	1972	1825–3200	-
Belleville	Les Menuires	1964	1850–2850	Les Menuires, Reberty, La Masse
Belleville	Saint-Martin-de-Belleville	1983	1400–2434	-
Maurienne	Orelle	1997	900–3230	-

Within the Tarentaise Valley, there are various other resorts such as Paradiski (Les Arcs, La Plagne) and Espace Killy (Val d'Isère and Tignes). A weekly lift ticket in Les Trois Vallées used to allow one to ski one day in each of the other two systems mentioned although this has now been removed. There were once plans to interlink all systems and resorts to create the – by far – largest ski area in the world. However that vision was ended with the creation of the Vanoise National Park.

• List of ski areas and resorts in Europe
• French Alps

• Les Trois Vallées official website
• (https://www.skiline.co.uk/blog/10-best-ski-runs-in-the-three-valleys)