The Baltic Sea Port of Riga is the capital and largest city of Latvia. It is located on the Gulf of Riga, at the mouth of the Daugava River. Kiel is a major port city in northern Germany, located on the Kiel Fjord, an inlet of the Baltic Sea. It is the capital of the state of Schleswig-Holstein and has a population of over 240, 000 people. Both Riga and Kiel are important ports for trade and transportation in the Baltic Sea region.