Glaciers carved out Sarek and made it what it is today. They scraped away at the land to create the sharp ridges and peaks in Sarek.
Their continuous movement produces rock dust that is then carried away by the meltwater. Without glaciers in Sarek, the well-known Ráhpaäno Suorgudahka, the Rapaätno river delta, would not exist.
The ice sheet also has sculpted the large valleys, widening and rounding them off. Njoatsosvágge in Sarek is an example of such a classic U-valley where the ice sheet has rounded the contours. The reason the landscape is so striking is because of the amphibolite bedrock, which resists erosion especially well.