What river flows through 9 counties in states in the U.S. and is also a tributary to the Swannanoa River?
French Broad River:  The river flows through the counties of Transylvania, Buncombe, Henderson, and Madison in North Carolina, and Cocke, Jefferson, Sevier, and Knox in Tennessee, and drains large portions of the Pisgah National Forest and the Cherokee National Forest.
i don't know