Mermaid reports from the 1820s
2 cases, 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.

Mermaid · Argyll and Bute, Alba / Scotland · 1827
Witness reports that a young man discovered five mermaids, old and young, sleeping on rocks and playing in the water.

Mermaid · Baja California Sur, México · 1823
Witness reports that Hernando Grijalva claimed to have seen a mermaid-like creature in 1823 near the Gulf coast of Lower California.