Lago Dudú is a large freshwater lake fed by an underground spring, just off the main road and hidden in the bush. The lake is so deep that scuba divers go down regularly, but rumor has it that no one has ever located the bottom. You'll be greeted by great rope swings and really cold water throughout the year. There's also a cave you can swim into.
Carretera Río San Juan, Km 21, Cabrera, Dominican Republic