This study presents the characteristics of passenger line of east Adriatic, the impact of this type of shipping on island tourism and the importance of maritime-passenger ports in the Republic of Croatia. Passenger line is the most important for linking the islands with the mainland, the islands to each other, to the sustainable development of the island in economic terms and to prevent the population from leaving the island. Success for the above reasons can only be achieved through continuous investment in ships that sail on that line, replacing for modern ships with higher speeds, renew with quality accommodation an existing dilapidated ships and continuously invest in the ports and docks where the ships sail into. In addition, all the lines (RO-RO, speedboats (HSC) and ships) are listed in the paper, separately for each region (Rijeka, Zadar, Šibenik, Split and Dubrovnik), and finally provide traffic analysis for each region separately. The subject and purpose of the work is passenger line of east Adriatic, its current state, importance and impact on the state and further valorization of the existing conditions.