Nautical tourism is based on sailing and stay of tourists on the seacraft as well as their stationary stay for rest and other reasons. It is one of the most important and most developed forms of tourism in Croatia thanks to the indented coastline and natural resources. Seven coastal counties are participating in its development, and one of the most developed is the Šibenik-knin county. The effects of nautical tourism development can be positive and negative. Positive effects are income as well as employment. In 2017., nautical tourism revenues were about 850,000.000 kunas and a quarter of the revenue was made in Šibenik-knin county, which greatly assisted the development of the county. Negative effects are pollution of the environment and the destruction of sea flora and fauna as well as the air caused by ships and marinas. One of the greatest strenghts of nautical tourism in Croatia and thus the Šibenik-knin county is a less polluted environment than the other Mediterranean countries and its preservation is of great importance. This is why it is necessary to embark on a path of sustainable development whose goal is not only to preserve the environment but to fully harmonize environmental, economic and social goals.