The middle of the three western lakes, smaller than Sethlund but deeper. Something lives in Seron Lake's depths—something large enough to create waves on windless days and old enough that even the hags of Hagswood treat it with respect.
The creature (if it is singular) has never been clearly seen. Fishermen in the time before the empire reported glimpses of scaled coils, massive shadows passing beneath their boats. Now, with the lake abandoned, it presumably feeds on whatever falls or is thrown in. The hags are suspected of making offerings.