Hydrological Unit: Essex River-Frontal Ipswich Bay
| HUC | Name |
|---|---|
| 010900010301 | Essex Bay |
| 010900010302 | Jones River-Annisquam River |
| 010900010303 | Plum Island-Atlantic Ocean |
| 010900010304 | Ipswich Bay-Atlantic Ocean |
| 010900010305 | Sandy Bay-Atlantic Ocean |
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