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- Pend Oreille River1
- Pend Oreille, Lake (Idaho)1
- PennsylvaniaBucks County2
- PennsylvaniaChester County8
- PennsylvaniaDelaware County1
- PennsylvaniaPhiladelphia County1
- PennsylvaniaPhiladelphia Region1
- Pointe Coupée Parish (La.)1
- Poplar River Watershed (Sask. and Mont.)1
- Powder River Watershed (Wyo. and Mont.)1
- Puerto Rico2
- Puerto RicoBayamon Region1
- Puerto RicoCaguas1
- Puerto RicoDemajagua River Watershed1
- Puerto RicoEspíritu Santo River Watershed1
- Puerto RicoFajardo Region1
- Puerto RicoGurabo Region1
- Puerto RicoJuana Diaz Region1
- Puerto RicoJuncos Region1
- Puerto RicoManatí Region1