The Yuna River (Spanish: Río Yuna) is the second longest river in the Dominican Republic at in length. It forms within the Cordillera Central mountain range southwest of the city of Bonao in Monseñor Nouel Province, and passes through the fertile Cibao Valley. The river from there turns north-northeast passing the city of Bonao along the way. Southwest of Cotuí, the river reaches Hatillo Dam (Spanish: Presa de Hatillo) before turning northeast then east as it reaches its mouth at the Samaná Bay in the northeast part of the Dominican Republic. Like many rivers in the Dominican Republic, the name is derived from the Taíno language. Course The source of the Yuna is located southeast of the city of Santiago and northwest of the city of Santo Domingo. The source is located near the southern Monseñor Nouel village of La Cuesta de la Vaca within the municipality of Bonao on Cerro Montoso Hill (Spanish: Loma de Cerro Montoso) at an elevation of above sea level. The Cerro Montoso Hill lies along the highest mountain range in the West Indies, the Cordillera Central. The Cordillera Central provides the principal watershed and drainage divide for the Dominican Republic; the Yuna has its source along the northern slope of the mountain range. The Yuna descends from its headwaters running south then west where several streams feed into the river near the San José de Ocoa province border. The Yuna then turns north near the village of El Torito passing through several mountains including Torito Hill (Spanish: La Loma del Torito), and Middle Hill (Spanish: La Loma El Medio). The Yuna shifts north-northwest near the Middle Hill passing through several villages including Pino de Yuna, Piedra de los Veganos, and El Capa. The Yuna next flows into the village of Los Finitos where it travels in a more northerly course. The river then receives two tributaries along its left bank: the Blanco and Tireo River. The Yuna then heads northeast into lower elevations as the river leaves the Cordillera Central. The river passes through the village of Los Quemados, receiving several forks that originate within the Cordillera Central to the west. The river next bypasses Bonao to the northwest of the city. The Yuna then flows into the town of Los Arroces, receiving a major tributary, the Masopedro River, on the left bank. The Yuna then heads east passing under the Autopista Duarte before