The following thesis describes two different solutions for the marina in the Valdibora bay. The main object of the thesis was to examine the theoretical basis and the practical application of dimensioning quay walls, rubble mound breakwaters and setting the disposition of vessels in the marine. The thesis can be divided in two parts. The first part describes the history and state of nautical tourism in Croatia and Rovinj, gives an insight into the physical planning documents and natural base in the area of the planned port. The second part elaborates the disposition of vessels in the marina, explaines the methodology for calculation of rubble mound breakwaters and quay wall and are carried out calculations with accompanying descriptive documentation. The first variant of the marina provides water area of 7,3 ha and 391 mooring places.The maximum depth under the breakwater is 15 meters, while the average depth is 11.7 m. It is envisaged to build a rubble mound breakwater 598 meters long, with the concrete quay wall on the port side of the breakwater. It is also planned to build six floating piers, and one fixed pier in the north of the marina for additional protection from waves which will allow a temporary mooring of vessels waiting for the service area. The entrance is located on the northern part of the marina, with the width of 58 m. The breakwater is the most expensive structure planned to be built, therefore calculation of amount of material installed into the breakwater is made.In the first solution will be installed 249 571 m3 of stone material and 12 558 m3 of concrete. The second solution of the marina provides water area of 9,7 ha and 396 mooring places. The maximum depth under the breakwater is 17,2 meters, while the average depth is 13,7 m. It is envisaged to build a rubble mound breakwater 603 meters long, with the concrete quay wall on the port side of the breakwater. It is also planned to build three floating piers, and one fixed pier in the north of the marina for additional protection from waves which will allow a temporary mooring of vessels waiting for the service area. The entrance is located on the northern part of the marina, with the width of 99 m. In the second variant, in the breakwater, 298 664 m3 of stone material, will be build, which is 20% more then in the first variant, and 12588 m3 of concrete, which is 19% more than in the first variant. The conducted analysis has given the average to the first solution, primarily for the smaller depths on the breakwater, whereby the amount of the built-in material is greatly reduced and thus the price of the most exspensive construction in the port.