Exploration title
Easiest solution is to check the maps on the wiki since they include the borders of each discoverable area. From that you can see which ones contain no heart/poi/wp.
For Shiverpeak you might want to check Tail of the Serpent and Lair of the Coil in Timberline Falls.
For Magumma check Aurora’s Remains in Brisban Wildlands and The Serpentwinds in Metrica Province.
Was missing those 3 and calx’s hideout thanks a lot all done finally!