Þórisvatn
Þórisvatn
Coordinates	64°14′N 18°55′W / 64.233°N 18.917°W / 64.233; -18.917
Primary inflows	Þjórsá
Primary outflows	Þjórsá
Basin countries	Iceland
Surface area	88 km2 (34 sq mi)
Max. depth	109 m (358 ft)

Þórisvatn (Icelandic pronunciation: [ˈθouːrɪsˌvahtn̥] ^ⓘ; sometimes anglicized to Thorisvatn^[1]) is the largest lake of Iceland, situated at the south end of the Sprengisandur plateau within the highlands of Iceland.^{[citation needed]}

It is a reservoir with a surface area of about 88 km² (34 sq mi) and is fed by the river Þjórsá, which comes down from the glacier Hofsjökull. On its southern end, Þórisvatn is used to generate electricity at a power station. It is like other Icelandic lakes, which are mostly glacial lakes or volcanic lakes.

The lake grew from about 70 km² to 86 km^{2 [contradictory]} with the construction of the power station and was previously only the second largest lake in the country.

• List of lakes of Iceland
• Geography of Iceland

• Photo