A new nation that does not have access to a sea after ww1?

After World War I, several new nations emerged, with some lacking access to the sea due to territorial adjustments and the redrawing of borders. One example is Czechoslovakia, which was landlocked and had to rely on neighboring countries for trade routes. This lack of maritime access posed economic challenges and influenced its foreign policy and alliances in the interwar period. Additionally, landlocked nations often sought to secure trade agreements or access to ports through diplomacy with coastal countries.