| name | image | Average flow (m³/s) | basin (m²) | Height (m) | origin location | mouth location | Length (m) | latitude (°) | longitude (°) | canyon | Map |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Río Grande de San Miguel | Pacific Ocean | 13.5418000000 | -88.1846777778 | Map | |||||||
| Río Angue | Lake Güija | 14.2925000000 | -89.5113888889 | Map | |||||||
| Río Cusmapa | 14.2263888889 | -89.5208333333 | Map | ||||||||
| Lempa River |  | 362 | 18,246,000,640 | 1,200 | Pacific Ocean | 422,000 | 13.2561000000 | -88.8261000000 | Map | ||
| Comalapa River | Pacific Ocean | 13.3947000000 | -89.1125000000 | Map |