1. The Amazon Basin extends between the Brazilian Highlands and Guiana Highlands. 2. There are no insects found in the Amazon rainforests. 3. The river Ganga originates in the Gangotri glacier. 4. Extensive agriculture is practised in the Ganga-Brahmaputra Basin. 5. The density of population in the Ganga-Brahmaputra Basin is among the highest in the world.​