The term "Baltic Sea republic" refers to the countries that border the sea, namely Estonia, Latvia, and Lithuania. However, there are other terms that can be used as synonyms for this phrase. For example, the region can be referred to as the Baltic States, the Baltic countries, or simply as the Baltics. Additionally, some may opt to describe these countries as Eastern European nations or as part of the former Soviet bloc, given their history and proximity to Russia. Regardless of the terminology used, these countries are known for their unique cultures, beautiful landscapes, and their important role in European history.