What do the numbers after area names mean in World of Warcraft maps?

When I zoom out of the map to view the whole continent and hover my mouse over different areas of the map, I see some numbers inside parentheses after the area name e.g. 'Elwynn Forest (10-20)', `Darkshire (20-30)'. What do these numbers mean?

2 Answers

The numbers represent the suggested level range for the zone. Quests and mobs in that area will be tuned for characters within the specified range.

5

Its the leveling range :) Go to a zone when in your level range!

1