Semantic search
- Pilcomayo River
- Po Basin
- Poland
- Portugal
- Potomac River
- Prohladnaja Basin
- Protocol between the government of the Federal Republic of Germany, the French Republic and the Grand Duchy of Luxembourg concerning the establishment of an international commission to protect the Moselle against pollution
- Protocol for Sustainable Development of Lake Victoria Basin. Arusha, 29 November, 2003
- Pu Lun T'o Basin
- Puelo Basin
- Pungwe Basin
- Rajasthan, India
- Red (Song Hong) Basin
- Red Sea
- Red Sea-Dead Sea Water Conveyance
- Republic of Tajikistan and Turkmenistan on Cooperation in the Area of Joint Management
- Republic of Uzbekistan
- Revised convention pertaining to the creation of the Niger Basin Authority, signed at N'Djamena
- Rezvaya Basin
- Rhine Basin
- Rhone Basin
- Rio Chixoy
- Rio Grande (Rio Bravo)
- Rio Grande Basin
- Rio Grande Basin (North America)
- Rio Grande Basin (South America)
- River Cuareim Commission (CRC)
- Roia Basin
- Romania
- Russia
- Russian Federation
- Russian River
- Ruvuma Basin
- Rwanda
- Sabi Basin
- Saigon Basin
- Salaca Basin
- Salinas River
- Salinas Valley Groundwater Basin
- Salinas Valley Water Project
- Salween Basin
- Salween River
- Samur Basin
- San Antonio Dam
- San Juan Basin
- San Martin Basin
- Sanaga Basin
- Santa Rosa Plain Groundwater Subbasin
- Sarata Basin
- Sardar Sarovar Dam