Rusalsko (Bulgarian: Русалско) is a village located in Ardino Municipality, Kardzhali Province, Bulgaria.

Various fish like carp, catfish, tolostolob, zander, perch, and rudd are found here.

Nearby is a rock formation called The Ring, which offers a view of the dam and surrounding hills.

It includes some old walls up to 5 meters high, towers, an entrance, and the remains of an ancient church.

This 10th-century fortress has a well-preserved western wall and remnants of a basilica and tower have been discovered through excavation.