Samana Bay is a bay in the eastern Dominican Republic. The Yuna River flows into Samana Bay, and it is located south of the town and peninsula of Samana. Samana Bay, Spanish Bahia de Samana, bay located in the northeastern Dominican Republic and lying along the Mona Passage joining the Atlantic Ocean and the Caribbean Sea. Bounded on the north by the Samaná Peninsula, the bay measures about 40 miles (65 km) east-west and 15 miles (25 km) north-south. Its well-protected deepwater anchorages make it one of the finest natural harbours in the West Indies. The Yuna River empties into the bay, but only the lower course is navigable. The bay is a fishing and tourist site.