| East Branch Union River | |
|---|---|
| Location | |
| Country | United States |
| Physical characteristics | |
| Source | |
| • location | Maine |
| Mouth | |
• location | Union River |
• coordinates | 44°43′53″N 68°22′52″W / 44.7315°N 68.3810°W / 44.7315; -68.3810 |
• elevation | 32 feet (10 m) |
| Length | 21.6 miles (34.8 km) |
| Basin features | |
| Tributaries | |
| • left | Bog River |
| • right | Middle Branch Union River |
The East Branch Union River is a 21.6-mile-long (34.8 km)[1] river in Hancock County, Maine. From the outflow of Rocky Pond (44°47′33″N 68°08′34″W / 44.7924°N 68.1427°W / 44.7924; -68.1427 (West Branch Union River source)) in Maine Township 22 M D, the river runs 5.3 miles (8.5 km)[1] southwest to Spectacle Pond in Osborn. From the pond's outlet, the river runs 13.0 miles (20.9 km)[1] northwest, southwest, west and southwest to Graham Lake, where it joins the West Branch to form the Union River. The lower section of the East Branch forms the border between Mariaville and Waltham.