What forms the western boundary of the county that WAID is licensed to?
WAID: WAID (106.5 FM) is a radio station broadcasting an Urban Contemporary format. WAID:  Licensed to Clarksdale, Mississippi, USA, the station, also known as "Power 106.5," is currently owned by Radio Cleveland and features programming from ABC Radio . Clarksdale, Mississippi:  The western boundary of the county is formed by the Mississippi River.
the Mississippi River