| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Rio Sabalo | city | Panama | Panama | 9.07 | -78.15 | 314 | 0 |
| Rio Sagrado | city | Parana | Brazil | -25.56 | -48.81 | 830 | 1309 |
| Rio Sagrado | city | Parana | Brazil | -25.53 | -48.78 | 393 | 2509 |
| Rio Sagrado | city | Parana | Brazil | -25.58 | -48.80 | 1669 | 1175 |
| Rio Sal Arriba | city | Oaxaca | Mexico | 15.90 | -96.31 | 1174 | 4669 |
| Rio Salado | city | Ain Temouchent | Algeria | 35.39 | -1.09 | 249 | 45286 |
| Rio Salado | city | Izabal | Guatemala | 15.80 | -88.72 | 13 | 1261 |
| Rio Salado | city | Nuevo Leon | Mexico | 26.89 | -99.85 | 830 | 104 |
| Rio Salado | city | Tamaulipas | Mexico | 26.79 | -99.43 | 318 | 126 |
| Rio Saliceto | city | Emilia-Romagna | Italy | 44.82 | 10.82 | 45 | 31601 |
| Rio Salinas | city | Oaxaca | Mexico | 16.68 | -97.12 | 6709 | 520 |
| Rio San Jose | city | Oaxaca | Mexico | 16.17 | -96.40 | 9228 | 3295 |
| Rio San Juan | city | Dominican Republic | 19.23 | -69.32 | 830 | 16503 | |
| Rio San Juan | city | Huehuetenango | Guatemala | 15.35 | -91.30 | 5426 | 19711 |
| Rio San Juan | city | Oaxaca | Mexico | 16.09 | -96.65 | 2509 | 3484 |
| Rio San Juan Numi | city | Oaxaca | Mexico | 17.40 | -97.68 | 6824 | 1733 |
| Rio San Martino | city | Veneto | Italy | 45.59 | 12.11 | 26 | 44509 |
| Rio San Miguel | city | Oaxaca | Mexico | 16.73 | -98.00 | 1669 | 3810 |
| Rio San Miguel | city | Sucre | Venezuela | 10.43 | -64.20 | 62 | 93089 |
| Rio Santa | city | Junin | Peru | -11.18 | -74.60 | 1669 | 4426 |
| Rio Santa Cruz | city | Oaxaca | Mexico | 15.95 | -96.68 | 2509 | 4395 |
| Rio Santa Maria | city | Chihuahua | Mexico | 28.14 | -108.53 | 2562 | 298 |
| Rio Santa Rita | city | Chihuahua | Mexico | 26.80 | -106.60 | 7549 | 298 |
| Rio Santiago | city | Escuintla | Guatemala | 14.35 | -91.02 | 1669 | 32085 |
| Rio Santiago | city | Guerrero | Mexico | 17.25 | -100.32 | 2509 | 5066 |
| Rio Santiago | city | Oaxaca | Mexico | 16.67 | -97.26 | 6059 | 2972 |
| Rio Santiago | city | Ngobe-Bugle | Panama | 8.38 | -81.78 | 1863 | 3862 |
| Rio Santiago | city | Sucre | Venezuela | 10.64 | -63.02 | 830 | 6582 |
| Rio Santo | city | Bahia | Brazil | -14.07 | -39.37 | 830 | 963 |
| Rio Santo Aleixo - Cascata | city | Pernambuco | Brazil | -8.09 | -35.02 | 36 | 339056 |
| Rio Saucito | city | Sonora | Mexico | 29.22 | -110.87 | 849 | 69142 |
| Rio Scharlach | city | Santa Catarina | Brazil | -26.94 | -49.59 | 1187 | 616 |
| Rio Seco | city | Tucuman | Argentina | -27.27 | -65.56 | 1177 | 24244 |
| Rio Seco | city | Salta | Argentina | -24.63 | -64.40 | 2076 | 0 |
| Rio Seco | city | Santa Cruz | Bolivia | -18.67 | -63.24 | 1118 | 149 |
| Rio Seco | city | Magallanes y de la Antartica Chilena | Chile | -53.06 | -70.86 | 0 | 14656 |
| Rio Seco | city | Holguin | Cuba | 21.05 | -75.68 | 190 | 2899 |
| Rio Seco | city | Mayabeque | Cuba | 22.81 | -81.97 | 114 | 28421 |
| Rio Seco | city | Pinar del Rio | Cuba | 22.38 | -84.10 | 374 | 1490 |
| Rio Seco | city | Holguin | Cuba | 20.48 | -75.75 | 958 | 6406 |
| Rio Seco | city | Guantanamo | Cuba | 20.08 | -74.39 | 19 | 2965 |
| Rio Seco | city | Cibao Sur | Dominican Republic | 19.26 | -70.54 | 311 | 65384 |
| Rio Seco | city | Guayas | Ecuador | -2.13 | -80.26 | 830 | 10455 |
| Rio Seco | city | Guayas | Ecuador | -1.97 | -80.65 | 351 | 2855 |
| Rio Seco | city | Manabi | Ecuador | -1.13 | -80.88 | 164 | 1551 |
| Rio Seco | city | Huehuetenango | Guatemala | 16.03 | -91.47 | 3582 | 6695 |
| Rio Seco | city | Copan | Honduras | 14.97 | -88.90 | 2919 | 9912 |
| Rio Seco | city | Oaxaca | Mexico | 17.25 | -97.09 | 6889 | 3984 |
| Rio Seco | city | San Martin | Peru | -5.90 | -77.25 | 2542 | 6355 |
| Rio Seco | city | Ancash | Peru | -8.98 | -78.59 | 830 | 16318 |
| Rio Seco | city | Junin | Peru | -11.85 | -75.37 | 12588 | 20799 |
| Rio Seco | city | Leiria | Portugal | 39.67 | -8.79 | 830 | 18430 |
| Rio Seco | city | Faro | Portugal | 37.23 | -7.49 | 68 | 7594 |
| Rio Seco | city | Faro | Portugal | 37.03 | -7.91 | 16 | 46176 |
| Rio Seco | city | Falcon | Venezuela | 11.35 | -70.21 | 49 | 2458 |
| Rio Seco | city | Sucre | Venezuela | 10.59 | -62.89 | 180 | 5197 |
| Rio Seco | city | Anzoategui | Venezuela | 8.70 | -64.19 | 830 | 397 |
| Rio Seco Airport | airport | -18.20 | -63.26 | 1836 | 0 | ||
| Rio Seco Norte Diez | city | Tabasco | Mexico | 18.09 | -93.39 | 36 | 14724 |
| Rio Seco Numero 14 | city | Holguin | Cuba | 21.07 | -75.72 | 164 | 3196 |
| Rio Seco Numero Diecisiete | city | Holguin | Cuba | 21.10 | -75.71 | 104 | 2240 |
| Rio Seco Primera Seccion | city | Tabasco | Mexico | 18.11 | -93.32 | 29 | 17450 |
| Rio Seco Segunda Seccion | city | Tabasco | Mexico | 18.06 | -93.38 | 42 | 15413 |
| Rio Seco Segunda Seccion "A" | city | Tabasco | Mexico | 18.05 | -93.38 | 45 | 16473 |
| Rio Seco Segunda Seccion "B" | city | Tabasco | Mexico | 18.06 | -93.38 | 42 | 15413 |
| Rio Seco Segunda Seccion "C" | city | Tabasco | Mexico | 18.08 | -93.37 | 42 | 16234 |
| Rio Seco y Montana Segunda Seccion | city | Tabasco | Mexico | 17.97 | -93.37 | 72 | 22026 |
| Rio Seco y Puente de Doria | city | Hidalgo | Mexico | 20.21 | -98.51 | 6919 | 5183 |
| Rio Sena | city | Bahia | Brazil | -12.88 | -38.47 | 101 | 628623 |
| Rio Sereno | city | Chiriqui | Panama | 8.82 | -82.86 | 2791 | 11855 |
| Rio Sereno de Torti | city | Panama | Panama | 8.91 | -78.43 | 377 | 0 |
| Rio Seripe | city | Rio de Janeiro | Brazil | -22.53 | -41.95 | 0 | 21472 |
| Rio Sidra | city | Kuna Yala | Panama | 9.45 | -78.83 | 0 | 656 |
| Rio Sidra Airport | airport | 9.32 | -79.28 | 2719 | 0 | ||
| Rio Simbra | city | Comayagua | Honduras | 14.78 | -87.80 | 2700 | 4738 |
| Rio Simon | city | Sucre | Venezuela | 10.26 | -62.94 | 223 | 0 |
| Rio Sinho | city | Amazonas | Brazil | -9.48 | -66.80 | 318 | 0 |
| Rio Sito | city | Enriquillo | Dominican Republic | 18.20 | -71.09 | 118 | 67464 |
| Rio Sobrado | city | Parana | Brazil | -26.05 | -49.28 | 3349 | 3044 |
| Rio Sol | city | Pasco | Peru | -10.54 | -75.07 | 1669 | 1122 |
| Rio Sol | city | Puerto Rico | United States | 18.06 | -66.72 | 259 | |
| Rio Solo | city | Sucre | Venezuela | 10.29 | -63.36 | 1033 | 295 |
| Rio Sono | city | Tocantins | Brazil | -9.34 | -47.90 | 830 | 236 |
| Rio Sucio | city | Cauca | Colombia | 2.57 | -76.79 | 5186 | 5920 |
| Rio Sucio | city | Cauca | Colombia | 2.57 | -76.78 | 5186 | 5920 |
| Rio Sucio | city | La Libertad | El Salvador | 13.81 | -89.37 | 1669 | 59519 |
| Rio Sucio Adentro | city | Panama | Panama | 8.33 | -78.93 | 101 | 743 |
| Rio Sucio Afuera | city | Panama | Panama | 8.33 | -78.95 | 82 | 680 |
| Rio Sucio Afuero | city | Panama | Panama | 8.33 | -78.94 | 16 | 720 |
| Rio Sucio Highway Airstrip | airport | 13.77 | -89.37 | 1594 | 0 | ||
| Rio Sul | city | Santa Catarina | Brazil | -27.21 | -49.63 | 1669 | 33077 |
| Rio Sul Center Heliport | airport | -22.96 | -43.18 | 532 | 0 | ||
| Rio Sêco | city | Rio de Janeiro | Brazil | -22.77 | -42.67 | 830 | 15341 |
| Rio Sêco | city | Bahia | Brazil | -14.95 | -41.97 | 1932 | 9287 |
| Rio Sêco | city | Bahia | Brazil | -12.65 | -39.60 | 830 | 1496 |
| Rio Sêco | city | Bahia | Brazil | -12.42 | -39.77 | 830 | 1958 |
| Rio Sêco | city | Bahia | Brazil | -12.35 | -38.80 | 830 | 37864 |