Dulce River is a river in Guatemala, completely contained within the department of Izabal. It is part of a lake and river system that has become a popular cruising sailboat destination.
The river begins at the point where it flows out of Lake Izabal. At the entrance to the river there is a small Spanish colonial fort, the Castillo de San Felipe de Lara, built to stop pirates entering the lake from the Caribbean when this part of Central America was an important shipping staging point.