The clearest explanation of the differences between fantasy and surrealism I've yet to see comes from Ursula K. Le Guin's essay "The Critics, the Monsters, and the Fantasists."
3 Steps to Tell Surrealism from Fantasy Fiction
What Is ‘Speculative Fiction’ and How Do We Define It?
Thankfully, the definition of speculative fiction simple: Speculative fiction is any storytelling possessing elements that aren’t feasible based on modern technology or elements that cannot be explained by modern science.
