premise: The Baltic Sea borders Estonia.
hypothesis: Estonia . It is bordered to the north by the Gulf of Finland , to the west by the Baltic Sea , to the south by Latvia ( 343 km ) , and to the east by Lake Peipus and Russia ( 338.6 km ) . The territory of Estonia consists of a mainland and 2,222 islands and islets in the Baltic Sea , covering 45339 km2 of land and water , and is influenced by a humid continental climate .