Distances in Iceland are challenging to measure. The clouded sky seems so close. Not many trees and few familiar human structures to gauge from as one gazes across vast expanses of land. Artist Olafur Eliasson refers to this phenomena in his Ted talk.

https://www.ted.com/talks/olafur_eliasson_playing_with_space_and_light

The glacier is visible merging into cloud. It could be Vatnajökul, the largest glacier in Europe.