Dent du Lan, Mountain summit in Valais and Haute-Savoie, Switzerland and France
Dent du Lan is a mountain summit straddling the border between Switzerland and France, built from sedimentary rock layers. The peak rises to about 2087 meters and overlooks the surrounding valleys where hikers from nearby villages arrive from different directions.
The summit sits on the border fixed by the 1860 Treaty of Turin, which annexed Savoy to France and turned the Dent du Vélan into a frontier peak. The line runs from boundary stone no. 89 on the sunny slope, over the summit, to stone no. 90 on the shaded side, then north to the Morge stream, which carries the border down to Lake Geneva.
The summit marks the border set by the 1860 Treaty of Turin, when Savoy was attached to France. The line runs from boundary stone no. 89 on the sunny side, over the top, to stone no. 90 on the shaded side, then north to the Morge river, which forms the border down to Lake Geneva.
Trails ascending the peak can be accessed from several nearby villages that offer different starting points and route options. The best hiking season runs from early summer through early autumn when snow is not blocking the mountain paths.
The border here is not a straight line: it runs along the ridge and is marked by boundary stones, no. 89 on the sunny side below the summit and no. 90 on the shaded side. From no. 90 it heads north to the Morge, which carries the frontier down to Lake Geneva.
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