Okay, so how many sides are there to the flat Earth?
The only side that matters is the side that humans live on, but that doesn't mean earth hasn't got depth, at the very least 8 miles deep and probably a lot deeper. 8 miles is the deepest human beings have ever explored but the oceans are incredibly deep. And scripture talks about the 'great deep' and also says that earth has foundational pillars upon which God founded the whole thing, so there's no doubt earth has a lot of depth. There's also no doubt earth has mountains and valleys and hills. It just isn't a globe.