Saplunara Bay is situated on the SW side of Mljet Island and it is very popular anchorage for those who sail southern Dalmatia. Saplunara is well known for its nice beach and Blaca lagoon just SE of Saplunara.
Saplunara is well protected from bora (NE) and pretty ok protected from SE – jugo but totally open towards south and SW so check the forecast before spending the night there.
Blaca is an interesting lagoon SE from Saplunara. If you go there by a sail boat you have to anchor in front of the entrance, because it is very shallow. You can then go into the lagoon with your dinghy and bath in the warm water. The depth in the lagoon is around 0.5 meters.