| Gravelly Branch | |
| Name Other: | Tributary to Nanticoke River |
| Map Size: | 180 |
| Pushpin Map: | USA Delaware#USA |
| Pushpin Map Size: | 180 |
| Pushpin Map Caption: | Location of Gravelly Branch mouth |
| Pushpin Map Alt: | Map of Gravelly Branch mouth location |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Delaware |
| Subdivision Type3: | County |
| Subdivision Name3: | Sussex |
| Length: | 13.12miles[1] |
| Discharge1 Location: | Nanticoke River |
| Discharge1 Avg: | 47.77cuft/s at mouth with Nanticoke River[2] |
| Source1: | Ellendale Swamp on Sowbridge Branch divide |
| Source1 Location: | about 1 mile south-southeast of Ellendale, Delaware |
| Source1 Coordinates: | 38.8056°N -75.4097°W[3] |
| Source1 Elevation: | 45feet[4] |
| Mouth: | Nanticoke River |
| Mouth Location: | about 2 miles northeast of Middleford, Delaware |
| Mouth Coordinates: | 38.6864°N -75.5558°W |
| Mouth Elevation: | 3feet[5] |
| Progression: | Nanticoke River → Chesapeake Bay → Atlantic Ocean |
| River System: | Nanticoke River |
| Tributaries Left: | Gravelly Ditch |
| Tributaries Right: | Prong Number One Smith-Short and Willin Ditch Tussocky Branch |
| Waterbodies: | Collins Pond |
| Bridges: | Saw Mill Road (x2), US 113, W Robbins Road, Redden Road, Deer Forest Road, DE 18-404, Coverdale Road |
Gravelly Branch is a 13.12miles long 4th order tributary to the Nanticoke River in Sussex County, Delaware.
According to the Geographic Names Information System, it has also been known historically as:[3]
Gravelly Branch rises in Ellendale Swamp on the Sowbridge Branch divide about 1 mile south-southeast of Ellendale, Delaware, and then flows southwest to join the Nanticoke River about 2 miles northeast of Middleford.[5]
Gravelly Branch drains of area, receives about 45.2 in/year of precipitation, has a wetness index of 741.95, and is about 19% forested.[2]