That's an amazing picture - sort of reminds me of the Carta marina by Olaus Magnus. [1]

Not going to lie, I did kind of chuckle a bit at the part labeled "The Water Babies".

The artist is Bernard Sleigh [2].

[1] - https://en.wikipedia.org/wiki/Carta_marina

[2] - https://en.wikipedia.org/wiki/Bernard_Sleigh