Middle Branch Union River
# Middle Branch Union River

The Middle Branch Union River is a river in Hancock County, Maine, United States. From the outflow of Lower Middle Branch Pond (44°51′57″N 68°13′35″W﻿ / ﻿44.8659°N 68.2265°W﻿ / 44.8659; -68.2265﻿ (Middle Branch Union River source)) in Aurora, the river runs 13.8 miles (22.2 km) west and south to its confluence with the East Branch of the Union River in Osborn.

