Holston River joins up at Knoxville with which river that begins in Transylvania County, North Carolina? 
Holston River:  The Holston's confluence with the French Broad River at Knoxville marks the beginning of the Tennessee River. French Broad River: The French Broad River flows 218 mi from near the town of Rosman in Transylvania County, North Carolina, into the state of Tennessee.
French Broad River