Northern Indian subcontinent, stretching from the Indus River (west) to the Brahmaputra River (east). Area: ~1.7 million km²; population: >400 million.
Tropical monsoon: hot summers, cool winters, monsoon rains June–September.
One of the world's most fertile regions; major crops include rice, wheat, sugarcane. Major cities: Delhi, Kolkata, Mumbai (on fringes).
Home to numerous ethnic groups, religions, and languages.