- Ohio Drainage1
- Ohio River1
- Palermo, Sicily, Italy1
- Panama1
- Paraguay1
- Pee Dee1
- Pelzer (S.C.)1
- Pendleton, Anderson County, South Carolina, United States1
- Portland, Meigs County, Ohio, United States1
- Red Sea1
- Rhode Island, United States1
- Saint James1
- Salt River, Mississippi Drainage, Missouri, United States1
- San Francisco Bay, California, United States1
- San Luis Obispo, San Luis Obispo County, California, United States1
- Sandy Hook, Monmouth County, New Jersey, United States1
- Santee Canal, Berkeley County, South Carolina, United States1
- Senegal, Africa1
- Sicily, Sicily, Italy1
- South America1