Official regions, countries or states to be capitalized (a mix up obtained after a random internet research):
North Asia or Northern Asia (meaning Russia), northwest Asia (not the official region), Northeast Asia (Japan, Koreas), East Asia or Eastern Asia, South Asia or Southern Asia, Southeast Asia, West Asia or Western Asia, Southwest Asia or Southwestern Asia, Central Asia
North India (also Northern India?), Northeast India, South India (also Southern India?), West India or Western India, East India or Eastern India
Northern Europe (also North Europe?), Western Europe (also West Europe?), Southern Europe (also South Europe?), Eastern Europe (also East Europe?), Middle Europe or Central Europe
South Australia (a state), North Australia (a state), Western Australia (a state), Central Australia (a state), eastern Australia (not a state)
Australia and New Zealand
Melanesia
Micronesia
Polynesia
North America, South America, Middle America or Central America, Caribbean
the Near East, the Middle East or Mideast, the Far East
North Africa or Northern Africa, Northwest Africa, Northeast Africa, Southern Africa (a region), South Africa (a country), West Africa or Western Africa, East Africa or Eastern Africa, Central Africa or Middle Africa, Central African Republic (a country).
Any comments?