Lake to Sea over the Roof of the French Alps

The Route des Grandes Alpes is Europe's definitive mountain journey: from the shore of Lake Geneva to the palms of the Mediterranean over sixteen or seventeen Alpine passes, several above 2,500 meters, in one continuous 700 km line. Conceived in 1911 by the Touring Club de France to open the high Alps to the new automobile, it was only completed in 1937 when the road over the Col de l'Iseran, at 2,764 meters still the highest paved pass in the Alps, finally linked the chain end to end. The names along the way are the sacred geography of the Tour de France: the Galibier, where the race's founder raised a monument; the Izoard, whose lunar Casse Déserte enshrines the duels of Coppi and Bobet; the Bonette variant, whose summit loop touches 2,802 meters and calls itself Europe's highest road. Between the cols come the other Alps: Beaufort's cheese cellars, the stone hamlet of Bonneval-sur-Arc, Vauban's sky-high citadel at Briançon, Mexican-built villas in Barcelonnette, and marmots whistling from the roadside scree. Then, in a final unbroken descent through the Mercantour and the rally hairpins of the Turini, the snow gives way to olive terraces and the route drops you at Menton's lemon-scented seafront. Dip a wheel in the lake at the start and the sea at the end; that's the tradition, and this drive earns it.

Key Stops

Thonon-les-Bains. The spa town on Lake Geneva's French shore where the route's kilometer zero stands. Ride the funicular between town and port, touch the lake (tradition insists), and point the car at the wall of the Chablais.

The Chablais and Aravis passes. The opening day climbs through ski country made gentle in summer: Morzine, the Col des Gets, the cliff-hung Colombière, and the Col des Aravis, where the terraces of La Clusaz face Mont Blanc head-on. This is reblochon country; the farm-made cheese is the first of the route's edible souvenirs.

Beaufort and the Cormet de Roselend. Beaufort's cooperative ages the "prince of gruyères" by the thousand-wheel cellar, and the climb above it circles the improbably turquoise Lac de Roselend before topping the wild, treeless Cormet. One of the route's most beautiful and least famous crossings.

Val d'Isère and the Col de l'Iseran. From Bourg-Saint-Maurice the road climbs the Tarentaise to Val d'Isère, then keeps going where sanity once stopped: the Iseran's barren upper ramps reach 2,764 meters, the highest paved pass in the Alps, opened in 1937 to complete this very route. Glaciers, marmots, and often snowbanks in July.

Bonneval-sur-Arc. The descent into the Maurienne lands at one of France's most beautiful villages: low stone houses roofed in lauze slabs, huddled exactly as they were built, with the national park wilderness of the Vanoise above. The route's most atmospheric coffee stop.

The Télégraphe and the Galibier. The classic double climb via the resort of Valloire ends at 2,642 meters on cycling's most mythic pass, where the monument to Tour founder Henri Desgrange stands and the Écrins massif fills the southern horizon. Down at the Col du Lautaret junction, the botanical garden faces the glaciers of La Meije.

Briançon. The highest city in France at 1,326 meters, its old town a complete Vauban fortress of steep golden streets and ramparts, part of the UNESCO listing of his works. The natural mid-route overnight and the best resupply on the itinerary.

The Col d'Izoard and the Queyras. The Izoard's southern flank is the Casse Déserte, a shattered ochre moonscape unlike anything else in the Alps, studded with memorials to the Tour's giants. Below, the Queyras offers Guillestre, the star-shaped Vauban stronghold of Mont-Dauphin, and the detour to Saint-Véran, one of Europe's highest villages.

The Col de Vars and Barcelonnette. Over the Vars into the Ubaye valley, where Barcelonnette's incongruous Mexican villas were built by emigrants who made fortunes in textile shops across the Atlantic and came home rich. A relaxed, sunny town that feels already half-southern.

The great choice: Cayolle or Bonette. The official route takes the Col de la Cayolle, green, narrow, and intimate, following gorges into the Mercantour National Park. The celebrated variant climbs the Col de la Bonette instead, whose extra summit loop around the Cime touches 2,802 meters and styles itself the highest through road in Europe, a stark, dark-scree upper world with military ruins and hundred-kilometer views. Both are magnificent; the Bonette is the bucket-list line.

The Mercantour cols and the Turini. The southern descent chains smaller, wilder passes past perched villages (Saint-Martin-Vésubie, the Couillole's red schist country) to the Col de Turini, the hairpin ladder made famous by the Monte Carlo Rally's night stages, then drops through Sospel's medieval toll bridge toward the sea.

Menton. Over the modest Col de Castillon, suddenly: palms, pastel facades, and the Mediterranean. Menton is France's lemon capital, with citrus gardens, a baroque old town stacked above the beach, and water warm enough to justify the ritual: park legally, walk to the shore, and finish what the lake began.

Driving Tips

Plan inside the season, and check the cols anyway. The full chain is reliably open only from mid-June to mid-September, stretching to mid-October in kind years; the Iseran, Galibier, and Bonette open last and close first, and fresh snow can shut any of them overnight even in August. Check pass status each morning; it's the route's one non-negotiable habit.

Fuel and charge in the valleys. There is nothing at the cols. Bourg-Saint-Maurice, Briançon, Guillestre, Barcelonnette, and Sospel are the dependable stops, resort towns fill the gaps, and EVs should charge overnight and enjoy clawing energy back on the descents.

Cross the big passes before lunch. Alpine weather runs on a schedule: clear mornings, building cloud, afternoon storms. Morning crossings also mean 15 to 20 degrees of temperature swing instead of hail at 2,700 meters, and empty summit car parks.

Book beds with the calendar in mind. July and August weekends fill the resort towns, while some high resorts close entirely between seasons in late September; Briançon and Barcelonnette are the reliable anchors year-round.

Choose your southern variant deliberately. Cayolle for green gorges and the official line, Bonette for maximum altitude and desolation; both include narrow single-lane stretches. Decide before Barcelonnette, not at the junction.

Eat the route. Beaufort from the cooperative cellars, reblochon from Aravis farms, génépi where the pastures grow it, Briançon's old-town tables, and lemon everything in Menton. The gastronomy tracks the geology.

For more information visit: Route des Grandes Alpes (Official Site)