Tourism in Croatia also affects the economic development of the country. Therefore, different strategies are being developed to strengthen the tourist demand for our country. Since contemporary society has been hit by global ecological and climate change, more attention is being paid to the sustainable development of tourism, in the preservation and protection of the environment in tourism itself. Therefore, tourist destinations are carrying out programs to attract tourists. Beaches represent the main tourist resource of Croatia. In order to make the beaches as beautiful as possible and to manage them as well, various ecological activities and programs are designed. An example of a well-known international and ecological program is the "Blue Flag". Although the "Blue Flag" project is a relatively "young phenomenon", it means a well-crafted coastal management system. This is well recognized in promoting sustainable development through strict criteria in water quality, education, environmental management and the provision of numerous services. The meaning of "Blue Flag" contributes to raising the general level of awareness of the need for environmental protection in the modern society. The significance of the "Blue Flag" is reflected in improving the quality of existing services and also, improving the respect for managing the beaches and marinas by service providers. Preserved beaches and equipped marinas represent high quality tourist products. The "Blue Flag" also contributes to the strengthening of coastal zone management apropos the growth of business success and tourism boom of our country. In the Istrian County, for many years, the highest beach was awarded with the international flag of the Blue Flag. Even 1/4 of the total number of Blue Flags in Croatia are in Istra County, in the City of Porec.