The crater lake Ljótipollur (“Ugly Puddle”) in the central Highlands of Iceland was formed in an explosion in the 15th C along the Torfajökull Volcanic System.
“The name in Icelandic has the contradictory meaning of “Ugly Pool” and could be explained by geothermal activity and murky water shortly after the eruption, of which there is no indication now.” [Ari Trausti Guðmundsson in Focus on Iceland, SALKA Publisher, 2008]

Ljótipollur, Highlands of Iceland
5D Mark II, Zeiss ZE 50 f/2 Makro Planar

Ljótipollur
5D Mark II, TS-E 24L II
Looks like the creator’s cauldron.
surreal !!