Just throwing 2 more cents: Show the list as a tree and their mob level ranges, like this:
  • La Noscea
    • Lower [levels 1-10]
      • Moraby Drydocks
    • Eastern [levels 10-20]
      • Costa Del Sol
      • Wineport
    • Western [levels 20-30]
      • Swiftperch
      • Aleport

And yes, I know the levels are off. It's just an example. =)