The lake Sultartangarlón () is situated in the Highlands of Iceland to the north of the volcano Hekla. It is a reservoir of the river Þjórsá, formed when the Þjórsá and Tungnaá rivers were dammed during the construction of the Sultartangi Hydropower Plant. Its surface area is 20 km<sup>2</sup>.
The reservoir is one of multiple reservoirs that have been constructed along the Þjórsá river for hydropower generation.
See also
- List of lakes of Iceland
- Geography of Iceland