| Name | Country | Feature class | Latitude | Longitude | |
|---|---|---|---|---|---|
551  | Volcán Sumaco  Cerro Sumaco,Monte Volcan Sumaco,Monte Volcán Sumaco,Volcan Sumaco,Volcán Sumaco | Ecuador, Napo | volcano elevation 3990m | S 0° 32′ 28'' | W 77° 37′ 38'' |
552  | Boca de Solano Boca de Solano,Solano | Ecuador, Guayas | locality | S 1° 2′ 33'' | W 79° 49′ 59'' |
| 553 | Isla Sin Nombre Isla Nameless,Isla Namles,Isla Sin Nombre,Nameless Island | Ecuador, Galápagos | island | S 0° 40′ 13'' | W 90° 35′ 7'' |
554  | Sinincay Sinincay | Ecuador, Azuay Cuenca > Sinincay | seat of a third-order administrative division | S 2° 51′ 3'' | W 79° 0′ 53'' |
| 555 | Cerro Sincholagua Cerro Sincholagua,Sincholagua,Sincholahua | Ecuador, Pichincha Quito > Pintag | mountain | S 0° 32′ 20'' | W 78° 22′ 6'' |
| 556 | Sigchos Sigchos,Sikchus | Ecuador, Cotopaxi Sigchos > Sigchos | seat of a second-order administrative division | S 0° 42′ 16'' | W 78° 53′ 19'' |
| 557 | Sidcay Sidcay | Ecuador, Azuay Cuenca > Llacao | populated place | S 2° 50′ 52'' | W 78° 57′ 19'' |
558  | Laguna Shogra Laguna Shogra,Laguna de Zhogra | Ecuador, Azuay | lake | S 3° 10′ 26'' | W 79° 12′ 15'' |
| 559 | Shell Shell,Shell Mera | Ecuador, Pastaza Province Cantón Mera > Shell | seat of a third-order administrative division | S 1° 30′ 19'' | W 78° 3′ 47'' |
| 560 | North Seymour Island Isla Seymour Norte,North Seymour Island | Ecuador, Galápagos | island | S 0° 23′ 41'' | W 90° 17′ 3'' |
| 561 | Seymour Seymour | Ecuador, Galápagos Santa Cruz > Santa Rosa | locality | S 0° 27′ 3'' | W 90° 15′ 51'' |
| 562 | Sayausí Sayausi,Sayausid,Sayausí | Ecuador, Azuay Cuenca > Sayausi | populated place | S 2° 52′ 17'' | W 79° 4′ 20'' |
| 563 | Sarayacu Nuestra Senora de la Palina de Sarayacu,Nuestra Señora de la Palina de Sarayacu,Sarayaco,Sarayacu | Ecuador, Pastaza Province Pastaza > Sarayacu | populated place | S 1° 44′ 11'' | W 77° 29′ 5'' |
| 564 | Saraguro Saraguro,Zaragura | Ecuador, Loja Saraguro > Saraguro | seat of a second-order administrative division | S 3° 37′ 28'' | W 79° 14′ 21'' |
| 565 | Saquisilí Saquisili,Saquisilí | Ecuador, Cotopaxi Saquisilí > Saquisili | seat of a second-order administrative division population 3,778 | S 0° 50′ 23'' | W 78° 40′ 1'' |
| 566 | Volcán Sierra Negra Cerro Grande,Cerro Negro,Sierra Negro,Volcan Grande,Volcan Santo Tomas,Volcan Sierra Negra,Volcán Sa... | Ecuador, Galápagos | volcano | S 0° 49′ 7'' | W 91° 7′ 38'' |
| 567 | Isla Santay Isla Santay | Ecuador, Guayas Durán > Eloy Alfaro (Duran) | island | S 2° 13′ 9'' | W 79° 51′ 9'' |
| 568 | Santa Rosa de Sucumbíos Columbia,San Miguel de Sucumbios,San Miguel de Sucumbíos,Santa Barbara,Santa Bárbara,Santa Rosa Sucu... | Ecuador, Sucumbíos Lago Agrio > Jambeli | populated place | N 0° 22′ 36'' | W 77° 7′ 49'' |
| 569 | Santa Rosa de Cusubamba Cusibamba,Cusubamba,Hacienda Cusubamba,Santa Rosa,Santa Rosa de Cusubamba | Ecuador, Pichincha Cayambe > Santa Rosa De Cuzubamba | populated place | S 0° 2′ 41'' | W 78° 16′ 19'' |
| 570 | Isla Santa María Charles,Isla Carlos,Isla Floreana,Isla Santa Maria,Isla Santa María | Ecuador, Galápagos | island | S 1° 17′ 18'' | W 90° 25′ 54'' |
| 571 | Santa María Correo,El Correo,Floreana,Puerto Flores,Santa Maria,Santa María | Ecuador, Galápagos Cantón San Cristóbal > Isla Santa María (Floreana) (Cab. En Pto. Velasco Ibarra) | populated place | S 1° 15′ 0'' | W 90° 27′ 0'' |
| 572 | Santa Lucía Santa Lucia,Santa Lucía | Ecuador, Guayas Guayaquil > Guayaquil | populated place population 12,523 | S 2° 11′ 0'' | W 80° 0′ 0'' |
| 573 | Isla Santa Fé Barrington,Isla Santa Fe,Isla Santa Fé | Ecuador, Galápagos | island | S 0° 49′ 4'' | W 90° 3′ 31'' |
| 574 | St. Elena Point Cabo Santa Elena,La Puntilla,Punta Santa Elena,Puntilla de Santa Elena,Saint Elena Point,St. Elena P... | Ecuador, Santa Elena | point | S 2° 11′ 25'' | W 81° 0′ 40'' |
| 575 | Isla Santa Cruz Indefatigable,Isla Chaves,Isla Chavez,Isla Santa Cruz,Isla Santa Cruz Indefatigable | Ecuador, Galápagos | island | S 0° 37′ 8'' | W 90° 20′ 17'' |
| 576 | Santa Clara Island Amortajada,El Muerto,Isla Santa Clara,Isla del Muerto,Santa Clara Island | Ecuador, El Oro Cantón Santa Rosa > Jambeli | island | S 3° 10′ 20'' | W 80° 26′ 10'' |
| 577 | Santa Ana de Vuelta Larga Santa Ana,Santa Ana de Vuelta Larga | Ecuador, Manabí Santa Ana > Santa Ana De Vuelta Larga | seat of a third-order administrative division population 12,833 | S 1° 12′ 28'' | W 80° 22′ 14'' |
| 578 | St. James Island Isla James,Isla Salvador,Isla San Salvador,Isla Santiago,Saint James Island,St. James Island | Ecuador, Galápagos | island | S 0° 16′ 0'' | W 90° 42′ 0'' |
| 579 | Cabo San Mateo Cabo San Mateo,Cabo de San Mateo,Punta San Mateo,Punta de San Mateo | Ecuador, Manabí Manta > Manta | point | S 0° 57′ 17'' | W 80° 49′ 8'' |
| 580 | San Juan San Juan | Ecuador, Los Ríos Vinces > Antonio Sotomayor (Cab. En Playas De Vinces) | populated place population 12,819 | S 1° 40′ 0'' | W 79° 46′ 0'' |
| 581 | San Joaquín San Joaquin,San Joaquín | Ecuador, Azuay Cuenca > San Joaquin | populated place | S 2° 53′ 45'' | W 79° 3′ 4'' |
| 582 | San Cristóbal Island Chatham Island,Isla Chatham,Isla San Cristobal,Isla San Cristóbal,SCY,San Cristobal Island,San Crist... | Ecuador, Galápagos Cantón San Cristóbal > El Progreso | island | S 0° 49′ 31'' | W 89° 25′ 27'' |
| 583 | San Clemente San Clemente | Ecuador, Manabí Cantón Sucre > Charapoto | populated place | S 0° 45′ 41'' | W 80° 30′ 38'' |
| 584 | San Antonio San Antonio,San Antonio de Ibarra | Ecuador, Imbabura Ibarra > San Antonio | seat of a third-order administrative division | N 0° 19′ 57'' | W 78° 10′ 13'' |
| 585 | San Antonio de Pichincha San Antonio,San Antonio de Pichincha | Ecuador, Pichincha Quito > San Antonio | populated place | S 0° 0′ 27'' | W 78° 26′ 52'' |
| 586 | Cape Salinas Cape Salinas,Punta Salina,Punta Salinas,Punta de Bagre,Salinas Point | Ecuador, Guayas Guayaquil > Puna | point | S 3° 1′ 23'' | W 80° 15′ 53'' |
| 587 | Salinas Salinas | Ecuador, Bolívar Guaranda > Salinas | populated place | S 1° 24′ 19'' | W 79° 1′ 7'' |
| 588 | Salasaca Salasaca | Ecuador, Tungurahua Province San Pedro de Pelileo > Salasaca | populated place | S 1° 19′ 11'' | W 78° 34′ 29'' |
| 589 | Salango Salango | Ecuador, Manabí Puerto López > Salango | seat of a third-order administrative division | S 1° 35′ 32'' | W 80° 50′ 33'' |
| 590 | Rumiñahui Cerro Ruminahui,Cerro Rumiñahui,Ruminahui,Rumiñahui | Ecuador, Cotopaxi Latacunga > Mulalo | mountain elevation 4721m | S 0° 38′ 0'' | W 78° 32′ 0'' |
| 591 | Ricaurte Ricaurte | Ecuador, Azuay Cuenca > Ricaurte | seat of a third-order administrative division | S 2° 51′ 43'' | W 78° 57′ 51'' |
| 592 | Volcán Reventador Reventador,Volcan El Reventador,Volcan Reventador,Volcán El Reventador,Volcán Reventador | Ecuador, Napo | volcano elevation 3562m | S 0° 40′ 32'' | W 77° 40′ 12'' |
| 593 | Roca Redonda Roca Redona,Roca Redonda | Ecuador, Galápagos | rock | N 0° 16′ 12'' | W 91° 37′ 31'' |
| 594 | Isla Rábida Isla La Rabida,Isla La Rábida,Isla Rabida,Isla Rabide,Isla Rábida,Isla Rábide,Jervis | Ecuador, Galápagos | island | S 0° 24′ 50'' | W 90° 42′ 30'' |
| 595 | Quisapincha Quisapincha,Quizapincha | Ecuador, Tungurahua Province Ambato > Quisapincha (Quizapincha) | seat of a third-order administrative division | S 1° 14′ 5'' | W 78° 41′ 4'' |
| 596 | Quingeo Quingeo,Quingueo,Quinjeo | Ecuador, Azuay Cuenca > Quingeo | populated place | S 3° 1′ 51'' | W 78° 55′ 55'' |
| 597 | Quilotoa Cerro Arcos,Quilotoa | Ecuador, Cotopaxi Sigchos > Chugchillan | mountain elevation 3914m | S 0° 50′ 53'' | W 78° 54′ 43'' |
| 598 | Quibil Quebele,Quibil | Ecuador, Loja Saraguro > Urdaneta (Paquishapa) | locality | S 3° 35′ 40'' | W 79° 11′ 35'' |
| 599 | Isla Puná Isla Puna,Isla Puná,La Puna,La Puná | Ecuador, Guayas Guayaquil > Puna | island | S 2° 49′ 38'' | W 80° 7′ 11'' |
| 600 | Puerto López Lopez,López,Puerto Lopez,Puerto López | Ecuador, Manabí Puerto López > Puerto Lopez | seat of a second-order administrative division | S 1° 33′ 31'' | W 80° 48′ 33'' |
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