Summary: Poland experienced its best moments in history when it had broad access to the Baltic Sea and was able to fully exploit its potential. From the 11th century onwards, all Polish rulers sought in various ways to gain and maintain the widest possible access to the sea. They militarly conquered the Pomeranian territories, subjugated them politically or granted them fiefdoms. This process continued for centuries with varying intensity and results. From glory and power, through stagnation and désintéressement in maritime affairs, to collapse in the 18th century. Significantly, it was during the period of partitions, when Poles lost not only their state but also access to the Baltic Sea, that they realized how important this attribute of sovereignty was. This bore fruit after 1918 and the regaining of independence, when a period of enormous growth in the importance of the Baltic Sea and investment in its potential began. Even in the years 1939-1945, can we encounter figures, places, and events that testify to Poland's “maritime” character. Throughout history, we cannot find an empire that did not have access to the sea or ocean. Let us mention only the ancient civilizations of Mesopotamia and Egypt, Persia, the Greeks, and the Romans. Later, there was the Ottoman Empire, the Venetians, southern European countries such as Spain and Portugal, and, in modern times, Greek shipowners. The Monroe Doctrine, Pax Americana and Britannica came in the 19th and 20th centuries. That was when the supremacy of Great Britain and the rise of the United States shaped today's economic landscape and security architecture around the world. The US, China, Russia, Japan, South Korea, Brazil, and France are just a few examples of countries that have made access to the sea the source of their power and enormous influence, resulting in a strong position in global maritime trade and increased global influence thanks to their naval fleets. Where was and is Poland in these processes? Purpose and research methods: The aim of the article is to recall the wide range of regulations, on the connections and consequences for all the consequences related to the presence of Poland on the Baltic Sea. Exposing oneself to risk, possibility and threat. The research method is a comparative analysis over the centuries. There are also elements of source texts. Conclusions / recommendations: The most important recommendation resulting from the text is to strengthen Poland's presence on the Baltic Sea in economic and military terms. Continuing investments and Poland's participation in many formats within the Baltic Sea basin countries.