- Ohio River, Ohio, United States5
- Ohio River, United States4
- Ohio, United States22
- Oregon, United States2
- Palermo, Sicily, Italy1
- Panama1
- Paraguay1
- Pee Dee1
- Pelzer (S.C.)1
- Pendleton, Anderson County, South Carolina, United States1
- Peru2
- Philadelphia, Philadelphia County, Pennsylvania, United States3
- Portland, Meigs County, Ohio, United States1
- Red Sea1
- Rhode Island, United States1
- Richland County (S.C.)2
- Saint James1
- Salt River, Mississippi Drainage, Missouri, United States1
- San Francisco Bay, California, United States1
- San Joaquin Valley, California, United States2