Jungfraujoch, Rail mountain pass in Bernese Alps, Switzerland

Jungfraujoch is a glacier saddle at 3,463 metres (11,362 ft) between the Jungfrau and the Mönch in the Bernese Alps, on the border of the cantons of Bern and Valais. The broad snow saddle, broken by dark rocky outcrops, is overlooked by the Sphinx, a rocky spur about 600 metres east. The Jungfrau Railway station at 3,454 metres, Europe's highest, lies east of the saddle below the Sphinx and connects to the Top of Europe building.

The railway opened in 1912 after 16 years of construction, becoming the highest rail line in Europe at the time. Engineers blasted kilometers of tunnels through the interior of the Eiger to reach the saddle.

Joch is a Swiss and Austro-Bavarian German word for a saddle between two peaks, recorded as a place name in the 14th century. The Jungfrau above it was probably named after the Jungfrauenberg at Wengernalp, owned by the nuns of Interlaken Monastery; after the first ascent in 1811 the peak was jokingly called Mme Meyer after climber Johann Rudolf Meyer.

Warm clothing is necessary year-round due to thin air and freezing temperatures at this elevation. Trains depart from Grindelwald and Lauterbrunnen several times daily, climbing steadily through the mountain interior.

Several viewing windows were carved directly into the rock face of the Eiger, allowing passengers to look out onto glaciers during the journey. The station includes an ice palace carved into the natural glacier beneath the surface.