| Number | 2121 |
| Lake code | PY0021 |
| District code | PY |
| Lake number | 21 |
| Prefix | Balsa de las |
| Official name | Negras Inf. |
| Suffix | |
| Latitude | 42.791440 |
| Longitude | -0.466250 |
| Altitude (m) | 2023.000000 |
| Survey code | |
| Survey check | 0 |
| A_prefix | |
| Alternative name | |
| A_suffix | |
| River basin | Ebro |
| Region / Province | Aragon |
| Country | Spain |
| Map_link |