Changes in certain areas have a big impact on many factors such as: transport, tourism, economy, environment but also the population of the area. Every change has its positive and negative sides. It is very important, if there are significant changes in area, to pay attention to the environment, and the possibility of accepting new changes. Therefore, the aim of this paper was to explain the significance of geospatial phenomena and processes on the Peljesac peninsula and how this changes will affect area and sustainable tourism, based mostly on the example of construction and commissioning of the Peljesac bridge. Croatian territory has been divided into two parts for many years. The area of Dubrovnik-Neretva country was separated from the rest of the country by the territory of Bosnia and Herzegovina. The Peljesac bridge is one of the largest projects in the Republic of Croatia, which in the future will be of great importance for many industries, and, in addition, to having a great impact on space and the environment. It can be said that the meaning of the bridge itself brings changes in two contexts: geopolitical, but also in a geostrategic context. So, in this case, it is certainly about state geopolitical activity, but also about international and social relations and spatial-political relations within them. In the geostrategic sense, geographic space requires consideration and evaluation of spatialfunctional processes and relationships, so it is very important to monitor all the effects it will bring to the Peljesac peninsula.