The Yuna River (Spanish: Río Yuna) is the second longest river in the Dominican Republic at 185.17 km (115.06 miles) in length. It forms within the Cordillera Central mountain range southwest of the city of Bonao and passes through the fertile Cibao Valley. The river from there turns north-northeast passing the city of Bonao along the way. Southwest of Cotui, the river reaches Hatillo Dam (Spanish: Presa de Hatillo) before turning northeast then east as it reaches its mouth at the Samana Bay in the northeast part of the Dominican Republic.