I think the problem with this is defining what is 'supernatural' in a setting. We can define it from our real worl perspective, of course, but a lot of things might be considered perfectly normal to people living in a fantastic world.
"Yep, that there waterfall has flowed upwards since anyone can remember. Just a fact of life around these parts. Oh and that sky island up there? Great pasture for grazing, the dogs are smart enough to keep the sheep from falling off. Though you have to be brave to cross the bridge to get there!"