| Name | Country | Feature class | Latitude | Longitude |
3501  | Río Minas 0.549509-77.774931 | Ecuador, Carchi | stream | N 0° 32′ 58'' | W 77° 46′ 29'' |
3502  | Quebrada Minas -3.788911-79.291752 | Ecuador, Loja | stream | S 3° 47′ 20'' | W 79° 17′ 30'' |
3503  | Quebrada Miñarica -1.2666667-78.6833333 | Ecuador, Tungurahua Province | intermittent stream | S 1° 16′ 0'' | W 78° 41′ 0'' |
3504  | Río Mina -2.75-79.75 | Ecuador, Guayas | stream | S 2° 45′ 0'' | W 79° 45′ 0'' |
3505  | Río Milmil -2.4833333-79.1 | Ecuador, Cañar | stream | S 2° 29′ 0'' | W 79° 6′ 0'' |
3506  | Quebrada de Milín -0.992303-78.945689 | Ecuador, Cotopaxi | stream | S 0° 59′ 32'' | W 78° 56′ 44'' |
3507  | Quebrada Milchigchig -2.89327-78.9642 | Ecuador, Azuay | stream | S 2° 53′ 35'' | W 78° 57′ 51'' |
3508  | Río Miguila -3.0833333-79.2 | Ecuador, Azuay | stream | S 3° 5′ 0'' | W 79° 12′ 0'' |
3509  | Quebrada Miglahuaicu -0.75-78.6833333 | Ecuador, Cotopaxi | stream | S 0° 45′ 0'' | W 78° 41′ 0'' |
3510  | Río de Miel -2.4-80.1666667 | Ecuador, Guayas | intermittent stream | S 2° 24′ 0'' | W 80° 10′ 0'' |
3511  | Río Michuquer 0.666399-77.706614 | Ecuador, Carchi | stream | N 0° 39′ 59'' | W 77° 42′ 23'' |
3512  | Quebrada de Michacalá -0.997498-78.871089 | Ecuador, Cotopaxi | stream | S 0° 59′ 51'' | W 78° 52′ 15'' |
3513  | Quebrada Merizalde -0.1666667-78.4833333 | Ecuador, Pichincha | stream | S 0° 10′ 0'' | W 78° 29′ 0'' |
3514  | Río Merced -1.3833333-78.2833333 | Ecuador, Tungurahua Province | stream | S 1° 23′ 0'' | W 78° 17′ 0'' |
3515  | Quebrada de la Merced 0.0666667-78.4166667 | Ecuador, Pichincha | stream | N 0° 4′ 0'' | W 78° 25′ 0'' |
3516  | Río Memé Chico -0.191817-79.082041 | Ecuador, Pichincha | stream | S 0° 11′ 30'' | W 79° 4′ 55'' |
3517  | Quebrada Melloco-huaicu -0.6833333-78.55 | Ecuador, Cotopaxi | intermittent stream | S 0° 41′ 0'' | W 78° 33′ 0'' |
3518  | Río del Medio 0.6166667-77.8333333 | Ecuador, Carchi | stream | N 0° 37′ 0'' | W 77° 50′ 0'' |
3519  | Estero Medina -3.4666667-79.9333333 | Ecuador, El Oro | stream | S 3° 28′ 0'' | W 79° 56′ 0'' |
3520  | Río Mazán -2.868022-79.0876 | Ecuador, Azuay | stream | S 2° 52′ 4'' | W 79° 5′ 15'' |
3521  | Quebrada del Mayordomo 0.706971-78.014523 | Ecuador, Carchi | stream | N 0° 42′ 25'' | W 78° 0′ 52'' |
3522  | Río Mayo -4.970654-79.07375 | Ecuador, Zamora Chinchipe | stream | S 4° 58′ 14'' | W 79° 4′ 25'' |
3523  | Canal de Matorrillos -2.519908-79.778674 | Ecuador, Guayas | canal | S 2° 31′ 11'' | W 79° 46′ 43'' |
3524  | Río Matecito -1.9-79.7 | Ecuador, Guayas | stream | S 1° 54′ 0'' | W 79° 42′ 0'' |
3525  | Quebrada Mataperro -3.9666667-79.4 | Ecuador, Loja | stream | S 3° 58′ 0'' | W 79° 24′ 0'' |
3526  | Río Matapalo -1.6833333-80.7 | Ecuador, Guayas | stream | S 1° 41′ 0'' | W 80° 42′ 0'' |
3527  | Río Matapalo -1.4666667-79.9333333 | Ecuador, Guayas | stream | S 1° 28′ 0'' | W 79° 56′ 0'' |
3528  | Quebrada Matapalo -3.7666667-80.0666667 | Ecuador, El Oro | stream | S 3° 46′ 0'' | W 80° 4′ 0'' |
3529  | Estero de Matanzas -2.1666667-79.8666667 | Ecuador, Guayas | stream | S 2° 10′ 0'' | W 79° 52′ 0'' |
3530  | Río Matalanga -4.071574-80.098709 | Ecuador, Loja | stream | S 4° 4′ 17'' | W 80° 5′ 55'' |
3531  | Quebrada Mataglo -2.9333333-78.7333333 | Ecuador, Azuay | stream | S 2° 56′ 0'' | W 78° 44′ 0'' |
3532  | Quebrada Matadero -4.2666667-80.05 | Ecuador, Loja | stream | S 4° 16′ 0'' | W 80° 3′ 0'' |
3533  | Estero Mata de Guineo -2.390841-79.618707 | Ecuador, Guayas | intermittent stream | S 2° 23′ 27'' | W 79° 37′ 7'' |
3534  | Quebrada Masa -3.4-79.3166667 | Ecuador, Azuay | stream | S 3° 24′ 0'' | W 79° 19′ 0'' |
3535  | Río Martillo -2.834154-78.625902 | Ecuador, Azuay | stream | S 2° 50′ 2'' | W 78° 37′ 33'' |
3536  | Quebrada Martamala -3.2666667-79.0166667 | Ecuador, Azuay | stream | S 3° 16′ 0'' | W 79° 1′ 0'' |
3537  | Río de la Marota -2.5833333-79.35 | Ecuador, Azuay | stream | S 2° 35′ 0'' | W 79° 21′ 0'' |
3538  | Río Mariviña -2.95-79.5666667 | Ecuador, Azuay | stream | S 2° 57′ 0'' | W 79° 34′ 0'' |
3539  | Río Marcos 0.0666667-80.05 | Ecuador, Manabí | stream | N 0° 4′ 0'' | W 80° 3′ 0'' |
3540  | Quebrada Marco -3.328538-79.113719 | Ecuador, Azuay | stream | S 3° 19′ 42'' | W 79° 6′ 49'' |
3541  | Canal de Marchena 0.196355-90.378714 | Ecuador, Galápagos | channel | N 0° 11′ 46'' | W 90° 22′ 43'' |
3542  | Río Maratiyacu -1.736188-77.113104 | Ecuador, Pastaza Province | stream | S 1° 44′ 10'' | W 77° 6′ 47'' |
3543  | Río Mapota -1.4166667-78.25 | Ecuador, Tungurahua Province | stream | S 1° 25′ 0'' | W 78° 15′ 0'' |
3544  | Río Mapa Yacu -1.6833333-78.65 | Ecuador, Chimborazo Province | stream | S 1° 41′ 0'' | W 78° 39′ 0'' |
3545  | Quebrada Mapayacu -1.7-78.6833333 | Ecuador, Chimborazo Province | stream | S 1° 42′ 0'' | W 78° 41′ 0'' |
3546  | Quebrada Mapahuaicu -0.75-78.6833333 | Ecuador, Cotopaxi | stream | S 0° 45′ 0'' | W 78° 41′ 0'' |
3547  | Quebrada Mapacocha -2.9666667-79.0166667 | Ecuador, Azuay | stream | S 2° 58′ 0'' | W 79° 1′ 0'' |
3548  | Río Manzano Huaicu -1.05-78.7333333 | Ecuador, Cotopaxi | stream | S 1° 3′ 0'' | W 78° 44′ 0'' |
3549  | Quebrada Manzano Huaicu 0.355872-78.085863 | Ecuador, Imbabura | stream | N 0° 21′ 21'' | W 78° 5′ 9'' |
3550  | Río Manzano -3.213032-79.140308 | Ecuador, Azuay | stream | S 3° 12′ 46'' | W 79° 8′ 25'' |