Tindfjallajökull is a stratovolcano in the south of Iceland[1]. It has erupted rocks of basaltic to rhyolitic composition, and a 5-km-wide caldera was formed during the eruption of the 54,000 year old Thórsmörk Ignimbrite. It is capped by a glacier of 19 km²[2]. Its highest peak is Ýmir (1462m)[2][3], which takes its name from the giant Ýmir of Norse mythology. The most recent eruption was at an unknown time in the Holocene[1].
The name means "Tindfjöll glacier". Tindfjöll ("peak mountains") is a ridge that extends to the south of the glacier.
The rivers that flow from the glacier are Hvítmaga to the north-east, Gilsá to the south, Þórólfsá to the south-west, Valá to the north-west and Blesá to the north. Hvítmaga, Gilsá and Þórólfsá drain into Markarfljót while Valá and Blesá drain into Eystri Rangá.
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