The Aare is Switzerland's longest river, yet it flows entirely within the country's borders.

Science · Published 20 October 2026 Swipe more like this →

In short: Spanning 295 kilometers, the Aare is the primary tributary of the High Rhine. It drains nearly half of Switzerland, including the entirety of the central region. Beyond its geographical dominance, the river serves as a vital source of hydroelectric power, hosting over 40 plants along its winding, alpine-fed course.

The Aare originates in the Bernese Alps, specifically within the great Aare Glaciers west of the Grimsel Pass. Its primary water source is the Unteraargletscher, formed by the convergence of the Finsteraargletscher and Lauteraargletscher. From these high altitudes, the river descends 1,565 meters, carving through limestone at the Aare Gorge and passing through major lakes like Lake Brienz and Lake Thun. By the time it reaches its confluence with the Rhine, its discharge volume actually exceeds that of the Rhine itself.

The river's historical importance is reflected in its name, which dates back to the La Tène period and appears as Nantaror on the ancient Berne zinc tablet. Over centuries, it has been Latinized into various forms, including Arula and Araris. Its modern landscape was significantly reshaped during the 19th century by the Jura water correction project. This massive engineering feat diverted the river into the Lac de Bienne via the Aare-Hagneck Canal, transforming previously swampy, flood-prone terrain into the fertile plains now known as the vegetable garden of Switzerland.

Today, the Aare is central to Swiss life, serving as a popular site for urban swimming in Bern and a critical hub for energy production. However, it remains a powerful natural force. In May 2022, the river gained international attention following the tragic death of Emmeril Kahn Mumtadz, the son of an Indonesian governor. The incident sparked a unique digital phenomenon where netizens left negative reviews on the river's online listings, illustrating the complex intersection of modern digital behavior and the raw, untamable reality of a major alpine waterway.

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