Water Monster reports in Northern Mariana Islands
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 · Carolinas, Northern Mariana Islands · 1850
Witness reports that a sea monster recently seen on the coast of the Carolinas has been captured and is described as having the head of a whale with a snakish body.