Place
- Regensburg, Germany2
- Rio Grande de San Pedro, Brazil2
- River Bidasoa, Spain2
- River Madeira, Brazil2
- River Moselle, France2
- River Piquiry Guazu, Uruguay2
- River Tocantins, Brazil2
- River Uatuma, tributary of the Amazon2
- River Unare, Venezuela2
- River Urubú, tributary of the Amazon2
- Romblon, Philippines2
- Ruremonde, Limburg2
- Salamanca, Spain2
- Saluzzo, Italy2
- San Blas, Mexico2
- San Juan Nepomuceno, Colombia2
- Sant' Angelo, Naples2
- Santander, Old Castile2
- Saxony, Germany2
- Seven Islands, India2