This paper work begins with an introduction in which the theme and purpose of the research is elaborated and the work methods used in the writing of the paperwas also mentioned. In the second chapter of this final work comes the conceptual determination of nautical tourism, analysis of nautical tourism and their activities and the development of nautical tourism through history. The third chapter is also the chapter where the most is handled. This chapter analyzes the nautical tourism of the Gulfof Trieste, the nautical ports of Italy and Slovenia in that area. First, it is based on the general facts about nautical tourism of these two countries and then a more detailed analysis of each of the nautical ports in the area. Various offerings of the ports themselves and their capacity to receive a certain number of vessels are also analyzed. The fourth chapter consists of the analysis of the nautical offer on the "left side of Istria", on the Croatian coast, near the Gulf of Trieste, because of their immediate proximity, they represent competition to Italy and Slovenia. We analyze all ten nautical ports in the area and two projects that are currently being implemented and are related to the construction of new nautical capacities. The last part is a conclusion.