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|Surface area||4.0 km2 (1.5 sq mi)|
Fjallsárlón is a glacier lake at the south end of the Icelandic glacier Vatnajökull. Fjallsjökull which is part of the bigger glacier reaches down to the water of the lake and some ice-bergs are drifting by on its surface.
The glacier calving into the lagoon is a part of Vatnajökull National Park and the better known glacier lake Jökulsárlón is not far from there. From the glacier lake Breiðárlón a little river flows into the Fjallsárlón.