Sapphire Lake was a large lake located in the Inferus region of Darvasi. It was the northern edge of the Corthin Kingdom and the kingdom's largest supply of fish. Fed by the Sapphire River from the Ang'Mar Mountains, Sapphire Lake was home to an abundance of marine wildlife that served as a major food supply for the area. Many citizens settled along the shore in small fishing villages like Fabul.
In 6155AL, Fizzlegrub destroyed a natural dam causing the Sapphire River to divert into the Grey River. Sapphire Lake drained shortly afterward forcing the inhabitants of the fishing villages to leave. At the bottom of the lake Fizzlegrub found a shrine that housed the spirit of Glaigawal, an avatar of Glaile.