France–Switzerland border partially coincident with Lake Geneva
South of Les Rousses it turns to the south and then southeast, running towards Lake Geneva, rising to 1,400 m at 46.4113°N 6.0866°E﻿ / 46.4113; 6.0866, passing south of La Dôle peak. Some 3 km before reaching the lake, the border runs parallel to the shore of Lake Geneva, forming the strip of land ceded by France to Switzerland in 1815 as the canton of Geneva, so that the City of Geneva has a land bridge connecting it to the rest of Switzerland.
The border now encircles the City of Geneva. West of the city, it follows the Rhône for some 6 km, until the westernmost point of Switzerland, at 46.1324°N 5.9559°E﻿ / 46.1324; 5.9559. The border passes between Geneva and Annemasse, heading east towards Saint-Cergues; it finally finds Lake Geneva from the south, at Hermance.
The border runs along the centre of Lake Geneva, but makes landfall before reaching the mouth of the Rhône, at Saint-Gingolph, which marks the western end of the Saint-Gingolph–Saint-Maurice railway in Switzerland. A project exists to reuse a now-abandoned line to Évian-les-Bains in France and thereby reconnect the two countries by train on the south shore of Lake Geneva. From here, the border runs south and southeast into the High Alps, forming the western border of the Valais. It passes Les Cornettes de Bise (2,431 m), the Dent de Barme (2,759 m), Petit Ruan (2,846 m), the Pointe des Rosses (2,965 m), the Pointe de la Fenive (2,838 m) and Le Cheval Blanc (2,830 m), placing the Lac du Vieux Émosson in Switzerland. From Grand Perrond (2,672 m), the border descends to 1,130 m, crossing the road from Martigny to Chamonix, before ascending to Les Grandes Otanes (2,656 m), the Aiguille du Tour (3,541 m), the Aiguille d'Argentière (3,898 m), Tour Noir (3,837 m) and finally to the tripoint with the French–Italian and Swiss–Italian borders, at a point just west of Mont Dolent, 45.9227°N 7.0441°E﻿ / 45.9227; 7.0441 and at 3,752 metres (12,310 ft) altitude.
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