Why is Estonia called the northernmost Baltic state?

Estonia is referred to as the northernmost of the three Baltic states because of its geographic position relative to its neighbors, Latvia and Lithuania.1

Located in northeastern Europe, Estonia is bounded by Latvia to the south and Russia to the east, while its northern and western borders are defined by the Baltic Sea. As the northernmost country in this regional grouping, it serves as the geographic anchor of the Baltic states along the eastern shores of the Baltic Sea.231