|Local Map||Harknori Reach|
Yrngreirn is a very deep lake sited in the southern area of Borngring. The lake rests in an active geothermal zone. The shoreline has frequent geyser eruptions which make the area hazardous to approach. The surface of the lake is often covered with algae and discolored from minerals and toxins.
In the deepest part of the lake is the sunken fortress Halanneg. This place is home to aboleth and their slaves.