Water Monster reports from the 1570s
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 · Loch Fyne, Alba / Scotland · 1570
A creature reported to be the size of a ship's mast surfaced from the water in July 1570.