In game push "m" for map et voilá, the region you have to look for your quest encounter
is shown by a red circle. Of course some encounters will only be spawned after interacting
with a quest item out of your inventory, but this info is given in your quest journal. So it
is a question of ...
1) taking the time to read within your journal. approx 1min
2) buying a 30$ scammer guide to just do the same ... reading info
The choice is with you, young padawan