Hydrological Unit: Cypress Swamp-Blackwater River
| HUC | Name |
|---|---|
| 030102020201 | Spring Branch-Blackwater River |
| 030102020202 | Otterdam Swamp |
| 030102020203 | Coppahaunk Swamp-Blackwater River |
| 030102020204 | Johnchecohunk Swamp-Cypress Swamp |
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