Water Monster reports from the 1630s
1 case, best-documented first. Page 1 of 1.
We map claims, not creatures. A case is what some source says someone saw or heard, with the link to that source. It is not proof that anything was there, and a retelling counts once, not as a second sighting.

Water Monster · Lynn, Massachusetts · 1633
Witness reports that a sea serpent was seen in Lynn in 1633 by Dr. [name].