Glacier Lake is located at the geographic center of Irrisen. It is a huge expanse of ice over 100 miles wide. The Frozen Road River flows in from the north and the Marbleflow River flows in from the south, while the Rimeflow River flows west out of the lake.
Rich wildlife inhabits the frigid lake. Glacier Lake is a substantial food source in Irrisen. The average citizen's diet is formed from trout, sturgeon, pike, and whitefish occasionally supplemented with cold-water molluscs and squid. Every village and town on the shores of the lake maintains a fleet of fishing vessels. Colonies of freshwater seals and walruses are common on the unsettled shores. Hunters bring meat blubber, skins and tusks harvested from these creatures.
Most fisherfolk work as close to the shore as possible as the remote center of the Glacier Lake is notorious for unexpected storms and hidden terrors. Many underwater cave complexes are home to amphibious boreal breeds, including isolated tribes of hostile locathahs , vicious freshwater merrows, and brutal scrags.
- Yalah the Pale is a rusalka witch inhabiting the center of the lake. A 40 years' old treaty between Elvanna and the Yalah, requires that a raft with three unfortunate male Jadwiga children be set adrift at the center of the lake on the eve of Pjallarane Day (1 Abadius) every year.
- Tirchagac, the warlord of the Scrag Deep tribe.
- Mike Shel. (2013). Irrisen, Land of Eternal Winter, p. inside front cover. Paizo Publishing, LLC. ISBN 978-1-60125-486-3
- Mike Shel. (2013). Irrisen, Land of Eternal Winter, p. 27–28. Paizo Publishing, LLC. ISBN 978-1-60125-486-3
- Matthew Goodall, Shaun Hocking, Rob McCreary, Philip Minchin, and William Thrasher. (2012). People of the North, p. 18. Paizo Publishing, LLC. ISBN 978-1-60125-475-7
- Mike Shel. (2013). Irrisen, Land of Eternal Winter, p. 12. Paizo Publishing, LLC. ISBN 978-1-60125-486-3