Does the geography of Arrakis make sense?
I'm always a bit confused about how big the planet is, and where everything fits. According to the map, every point of interest is above the 60 degree north latitude, but then everyone says that "the south polar regions are off-limits". But... the south pole would be extremely far away! There's like... an entire planet between Arrakeen and the south pole.
Also, from the map it seems that Arrakeen and Sietch Tabr are almost 90 degrees of longitude apart. How did Paul and Jessica conveniently end up very near to it after their escape?
How did Paul make it to Harg Pass to bury his father's skull in the middle of a razzia, when that's actually really far from both Arrakeen and presumably from where the attack was mounted? In that region the Fremen can't use worms, so that's a lot of area to cover in a Harkonnen-controlled region.
And finally, when Paul does his first worm ride, don't they make it from Sietch Tabr to Cave of Birds in one single ride? That also looks like a pretty impressive distance.
Well, the latter points are mostly minor head-scratches, but the leap from "north pole: safe" to "south pole: out of bounds, but we sometimes fly patrols there" has always confused me the most. Where is all the rest of the planet?