| Site Names | Salinity Ranges | Estuarine Zone | Co-ordinates | |
| Latitude | Longitude | |||
| E1 | 0 - 3 NST | Oligohaline | −25.7198611 | 32.6982694 |
| E2 | 3 - 5 NST | Euhaline | −25.733775 | 32.680644 |
| E3 | 5 - 18 NST | Mesohaline | −25.7622361 | 32.729275 |
| E4 | 18 - 27 NST | Polyhaline | −25.8324361 | 32.73435 |