Large gulf of the Baltic Sea. Bounded by Latvia and Estonia, it covers about 7,000 sq mi (18,000 sq km). The gulf, icebound from December to April, has a maximum depth of 177 ft (54 m). The coasts are mostly low and sandy, and several important rivers, including the Western Dvina, reach the sea there. Several ports and resorts, including Riga, line its shores.
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