The subject of this final paper is to analyze the offer, demand of vessels in the marinas of the Republics of Croatia and Montenegro. The main subject of this paper is to compare the business of marinas in the Republic of Croatia, which has been becoming a very popular nautical destination for many years, and the neighboring country of Montenegro, which is getting more popular among sailors, even globally. Most of the data collected are from different secondary sources, and the primary data used in this work are the results of data obtained with workers who were surveyed in different marinas in the Republic of Croatia. Much of the information was gathered from the Internet, as it contains the largest supply of different register in different marinas, as well as general information about the ports. This type of tourist offer is quite developed in the Republic of Croatia, and it is becoming more and more developed in the Republic of Montenegro. Therefore, the two countries are becoming competitors in this sector. The paper will be based on a comparison of the business and the popularity of nautical tourism, namely the marinas themselves in the two neighboring countries lying along the Adriatic coast. In order for this comparison to succeed, to obtain as accurate information if possible a lot of effort should be put into the interviews with people who are familiar with the work in the marina invest a lot of time in researching and getting in touch with people familiar with working in the marina. This provides as accurate information as possible.