The Free Hanseatic City of Bremen (official name in German: Freie Hansestadt Bremen) is the smallest of Germany's 16 federal states (Bundesländer). A more informal name, but used in some official contexts, is Land Bremen ('State of Bremen'). The state of Bremen consists of two separated enclaves: Bremen, which is the state capital, and the city of Bremerhaven. Both are located on the River Weser; Bremerhaven is further downstream and serves as a North Sea harbour. Both cities are completely surrounded by the neighbouring state of Lower Saxony (Niedersachsen). The two cities are the only administrative subdivisions the state has.