The Vordersee (also named Märjelen-Stausee) is a reservoir located east of the Aletsch Glacier, between the Strahlhorn and the Eggishorn, in the Swiss canton of Valais.

The lake has a surface area of 0.062 km² and is located at 2,360 metres above sea level.

It is located in the municipality of Fieschertal.

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