This paper investigates localities with early Christian architecture and stone plastic fragments on south Dalmatian islands and Pelješac peninsula. The area that is covered in this study spreads from the island of Sušac in the southwest to islands Mrkan and Bobara in southeast. In Late Antiquity on the territory of South Dalmatia Naronitan diocese and Diocese of Epidaurus were active, which most probably took over former borders of this territory. On majority of these islands early Christian architecture was found, except on the island of Korčula, which is the biggest island in south Dalmatian archipelago. This represents an isolated case because on this island only sporadic fragments of stone plastic were found. All churches that were found are linked to isolated areas with villae rusticae and sailing routes in this part of the Adriatic Sea. Systematic investigations were carried out on small number of localities and only layouts and descriptions of stone plastic fragments are found in literature. This area was studied mostly by art historians which explains given situation. Lack of discovered churches indicates that these islands are insufficiently investigated.