Autumn Light, United Kingdom. Photo credit: Andro Loria

A reservoir in Iceland. It is the largest body of water in the country. It is located in the south of the Icelandic plateau, near the Sprengisandur highland road.

Just that reservoir or the whole of Iceland? (They all speak English there already)

Is it the one called Sultartangalón

Could be ?

The lake in the middle looks like a screen.