This paper presents all the external and internal structures of a seaport that are necessary for one port to be able to function and operate successfully. Namely, for the construction of the port, it is first of all necessary to thoroughly research the area where the port will be built, which should enable the successful construction of maritime structures. Factors influencing the decision to build a port are geographical location, then hydrographic, oceanographic, geological and meteorological data, and finally economic criteria. Geographical location is an important factor because if the port is located near larger cities and roads then its development is far more successful. Natural factors are also very important to provide ideal conditions for easier and more favourable construction of facilities. The aim of this paper is to point out the complexity of port design, i.e. to point out how important it is to study all elements of port development in order to finally bring this project to life in the future and show results.