Lake Vulne is a mid-sized lake in Penoccida, being situated near the source of the Vencien River. It flows southward until eventually reaching the Bay of Bounty.
The lake, being fed by an underground spring, is known for its consistently warm temperatures throughout the year. This invites many people, whether they be locals from Vassalburg or visitors from elsewhere, to enjoy swimming or fishing in its waters. Additionally, its warm temperatures during the winter months mean that the elusive Florina's Sea Cow will swim upstream to the lake.