Union River (Maine)
General data
- Name: Union River (Maine)
- Water system: Atlantic Ocean
- Water type: River
- Source: Graham Lake
- Progression: Atlantic Ocean -> Planet Earth
- Climates: Temperate
- Continents: North America
- Countries: United States of America
The Union River is a 21.9-mile-long (35.2 km)[1] river that runs through Ellsworth, the county seat of Hancock County in eastern Maine. In the colonial era, it was known as the Mount Desert River.