Over 60% of humanity—more than 4.5 billion people—lives in Asia, the largest continent by both area (~44 million km²) and population. The vast majority concentrate in a handful of countries: China, India, Indonesia, Pakistan, Bangladesh, Japan, the Philippines, and Vietnam, which together hold ~75% of Asia's total. Drivers include fertile river valleys, favorable climates, cultural norms favoring larger families, and deep historical settlement patterns.