Link: https://en.wikipedia.org/wiki/Puntzi_Lake
It explains itself, and would be a great source for Coast to Coast.
Of course, if you think about it reasonably - think about it reasonably - then it makes a different sort of sense. By which I mean if you are paying attention you have just explained the whole Bigfoot mythology...
Note they don't mention bears - and I'm pretty sure they knew what they were.