Big Mountain Branch is a 2.11 mi (3.40 km) long 2nd order tributary to Aarons Creek in Halifax County, Virginia.

Big Mountain Branch rises at Red Bank, Virginia, and then flows generally southeast to join Aarons Creek about 1 mile northwest of Nelson.

[3] Big Mountain Branch drains 2.44 square miles (6.3 km2) of area, receives about 45.5 in/year of precipitation, has a wetness index of 394.71, and is about 46% forested.

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