https://www.coasttocoastam.com/article/watch-legendary-lake-monster-of-argentina-caught-on-film
https://www.travelawaits.com/2668751/legendary-lake-monsters
https://www.worldatlas.com/articles/10-sea-monsters-from-around-the-world.html
The Lake Monster or water-beasts have been seen all over the world. Could some of them be an offshoot from dinosaur times? When or where do the myths and legends end and the actual sightings occur?
https://en.wikipedia.org/wiki/List_of_lake_monsters
https://cryptidz.fandom.com/wiki/Lake_Monsters
https://en.wikipedia.org/wiki/River_Monsters
5 Most Mysterious & Unexplained Sea Creatures https://www.youtube.com/watch?v=Gl0XrQmkPm0
Even very LARGE bugs might be seen as monsters by some. Of course monsters are depicted in all shapes and sizes.
http://classicscifi.blogspot.com/search?q=monsters
https://desertshapes.blogspot.com/search?q=monsters
https://thedigitallabyrinth.blogspot.com/search?q=Lake+Monster