is it
The Pyrenees, The Alps or The Himalayas???

Davos actually isnt a mountain, it is a town in Switzerland famous for its winter sports. It is based at the foot of the Alps along the Landwasser River.

right in the heart of
Switzerland’s Graubünden. Excursions
by train, bus & cable-car, & walks
into the mountains, uncover a tapestry
of traditional Swiss villages, dramatic
views & abundant wildlife. Walkers
have access to both sides of the valley
by cable-car & funicular for a vast
supply of paths ranging from half hour
strolls to full day hikes. it has
complimentary use of selected cable-cars,
mountain railways etc so views of the
stunning peaks & dramatic alpineterrain come free (see ‘Davos Inclusive’ box below). Clavadeler Alp cheese factory or the Monstein brewery r within easy reach, whilst options for day trips include an enthralling ‘Bernina Express’ train ride down to Tirano in Italy, the historic city of Chur & the world-famous resort of St Moritz

it is the swiss ALPS! Albula Range

Well the others have answered it so I'd just like to point out that typing 'davos' into google is much faster than going through all the rigamorale of asking a question!