This is lovely Fláajökull, the "Sloping Glacier" in south-western #Iceland.
This creeping glacier is an outlet from Vatnajökull, and reached its maximum expansion in ≈ 1894. It has receded ≈ 2 km (1.25 mi) during the last 100 years, leaving a glacial lagoon at its snout.
I only noticed because I'm currently watching the live cams of the volcanic eruptions near Grindavik, which is in the south-west, and was wondering how far this glacier was from there. :)