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