| Dreieckhorn | |
|---|---|
 Dreieckhorn (left) and Aletschhorn (right), from the Aletsch Glacier | |
| Highest point | |
| Elevation | 3,811 m (12,503 ft) |
| Prominence | 192 m (630 ft) [1] |
| Parent peak | Aletschhorn |
| Isolation | 1.7 km (1.1 mi)  |
| Coordinates | 46°28′40.8″N8°1′11.9″E / 46.478000°N 8.019972°E |
| Geography | |
  Dreieckhorn Location in Switzerland | |
| Location | Valais, Switzerland |
| Parent range | Bernese Alps |
The Dreieckhorn is a mountain of the Bernese Alps, overlooking Konkordiaplatz in the canton of Valais.
The Konkordiaplatz or Concordia Place, is a flat area of snow and ice lying just to the south of the Jungfrau in the Bernese Alps in the Swiss canton of Valais. It is the junction of four large glaciers coming down from the Aletschfirn, the Jungfraufirn, the Ewigschneefäld and the Grüneggfirn. The main Aletsch Glacier originates from Konkordiaplatz. The Konkordiaplatz Charter was signed by the municipalities located in the Jungfrau-Aletsch Protected Area UNESCO World Heritage site, vowing to retain the aesthetic beauty of the region.
The Aletsch Glacier or Great Aletsch Glacier is the largest glacier in the Alps. It has a length of about 23 km (14 mi) (2014), a volume of 15.4 km3 (3.7 cu mi) (2011), and covers about 81.7 km2 (2011) in the eastern Bernese Alps in the Swiss canton of Valais. The Aletsch Glacier is composed of four smaller glaciers converging at Konkordiaplatz, where its thickness was measured by the ETH to be still near 1 km (3,300 ft). It then continues towards the Rhône valley before giving birth to the Massa. The Aletsch Glacier is – like most glaciers in the world today – a retreating glacier. As of 2016, since 1980 it lost 1.3 kilometres (0.81 mi) of its length, since 1870 3.2 kilometres (2.0 mi), and lost also more than 300 metres (980 ft) of its thickness.
Mary Petherick, also Mary Mummery was a mountaineer and writer, who was the first woman to ascend the Teufelsgrat.
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