Major River Deltas of the World

Deltas form where rivers deposit sediment faster than waves/currents remove it. Notable examples:

1. Nile Delta (Egypt) – Arcuate; 240 km Mediterranean coast; ancient agriculture; 40M+ people.
2. Ganges-Brahmaputra Delta (Bangladesh/India) – World's largest (105,000 km²); Sundarbans mangroves; cyclone-prone.
3. Mississippi Delta (USA) – Bird's-foot; 28,000 km²; subsidence + sea-level rise = rapid land loss.
4. Mekong Delta (Vietnam/Cambodia) – 40,000 km²; rice bowl; saltwater intrusion threat.
5. Amazon Delta (Brazil) – Tidal, forested; 100,000 km²; immense sediment flux.
6. Niger Delta (Nigeria) – 36,000 km²; oil-rich; mangroves; pollution/conflict.
7. Volga Delta (Russia) – Caspian Sea; 19,000 km²; sturgeon, lotus; expanding.
8. Irrawaddy Delta (Myanmar) – 30,000 km²; rice; Cyclone Nargis (2008) devastation.
9. Orinoco Delta (Venezuela) – 41,000 km²; distributary maze; Warao indigenous.
10. Rhône Delta (France) – Camargue; 9,000 km²; flamingos, rice, salt.

Deltas are dynamic, densely populated, and highly vulnerable to dams (sediment starvation), subsidence, sea-level rise, and storms.