Water Basin
- General 24
- Nile River >> Egypt 23
- Nile 23
- Groundwater 20
- Euphrates River >> Basra Governorate >> Iraq 17
- Shatt al Arab 17
- Tigris River >> Basra Governorate >> Iraq 17
- Tigris-Euphrates/Shatt al Arab 17
- Niger River >> Nigeria 14
- Niger 14
- Zambezi River >> Namibia 14
- Zambezi 14
- Columbia River >> Clatsop County >> Oregon >> United States 13
- Columbia 13
- Jordan River >> Israel 13
- Jordan 13
- Rhone 12
- Rhône 12
- Elbe River 11
- Elbe 11