Yes, the water really is that blue. This is Grjótagjá, a lava...

Yes, the water really is that blue. This is Grjótagjá, a lava cave in Northern Iceland. [OC][1916x1080] via /r/EarthPorn http://ift.tt/2te8LJz

via Tumblr http://ift.tt/2u9eeFK