Sometimes called “Llyn Llygad” (“Eye Lake”) due to its deep section in the middle which resembles an eye. It is also known as Llyn Pen Pared.
The photo above was taken from “Pared y Cefn Hir” the large hill above Cregennen Lakes. This is a nice place to get a good view, although you have to walk to the end of the hill to see it. You can also walk around the base.