Occupying the eastern two-thirds of the island of Hispaniola, the Dominican Republic is situated in the Caribbean between the North Atlantic Ocean and the Caribbean Sea. The blue Caribbean waters are one of the major reasons that tourists flock to the Dominican Republic. Underneath the deep blue waters, an underwater world is ready to be explored by scuba divers and snorkelers. The elaborate reef systems just off the coast house a vast array of ocean life.
Punta Cana is the center or tourism in the Dominican Republic; although it features the longest coral reef on the island, the snorkeling isn't optimal here. Sosua was the original hotbed of tourism in the Dominican Republic, when the industry took off in the 1970's. Since then, other areas have eclipsed Sosua, but it's still a good spot for visitors. There's good snorkeling here, both from the beach and among the reef reachable by boat. For the serious snorkeler, a better base of operations might be Bayahibe, where you'll find great snorkeling right off the beach. Bayahibe is a small fishing village with a good supply of restaurants, hotels and guest houses - along with a few big resort hotels - that support a growing tourist trade.
Bayahibe is also a good gateway to the Parque Nacional del Este, and it's just a short boat ride away from spectacular snorkeling around Saona Island and Catalina Island. The Wall and The Aquarium are two snorkeling destinations off the coast of Catalina Island that are not to be missed. Other great snorkeling spots include Catalinita Island and Canto de la Playa on Saona Island.