Tributaries: Yamuna, Gomti, Ghaghra, Gandak, Kosi. Holy in Hinduism; flows through densely populated Gangetic Plain.
Tributaries: Missouri, Ohio, Arkansas, Red. Longest in North America; major transport artery.
Tributaries: Negro, Solimões, Madeira, Tapajós. Second-longest globally; drains vast rainforest.
Tributaries: Jialing, Min, Han, Wu. Longest in Asia; economic lifeline through populous regions.
Tributaries: Blue Nile, White Nile, Atbara. World’s longest river; cradle of ancient civilization.