The French Broad River is a river in the U.S. states of North Carolina and Tennessee. It flows 218 miles from near the town of Rosman in Transylvania County, North Carolina, into Tennessee, where its confluence with the Holston River at Knoxville forms the beginning of the Tennessee River. The river flows through the counties of Transylvani…The French Broad River is a river in the U.S. states of North Carolina and Tennessee. It flows 218 miles from near the town of Rosman in Transylvania County, North Carolina, into Tennessee, where its confluence with the Holston River at Knoxville forms the beginning of the Tennessee River. The river flows through the counties of Transylvania, Buncombe, Henderson, and Madison in North Carolina, and Cocke, Jefferson, Sevier, and Knox in Tennessee. It drains large portions of the Pisgah National Forest and the Cherokee National Forest.