Big Branch is a long 1st order tributary to Aarons Creek in Mecklenburg County, Virginia.
Big Branch rises about 1 mile north of Siddon, Virginia, and then flows north-northwest to join Aarons Creek about 1.5 miles northeast of Hitesburg.
Big Branch drains of area, receives about 44.9 in/year of precipitation, has a wetness index of 430.03, and is about 55% forested.