The Elbe river flows through the Port of Hamburg, which is the third-largest port in Europe. With a population of approximately 1.8 million people, it is the second-largest city in Germany and eighth largest city in the European Union. Hamburg has a total area of 755 km2 (292 sq mi).
The St. Pauli Landungsbrücken (St. Pauli Landing Bridges), part of the Hamburg Harbour, are in the quarter St. Pauli, between the lower harbor and the Fischmarkt (Fish Market) directly on the Elbe River. The Landungsbrücken today are a major tourist attraction and a central transportation hub, with S-Bahn, U-Bahn and boat connections. There is an entrance to the Old Elbe tunnel directly at the western end of the Landungsbrücken. The eastern end of the building complex is marked by the Pegelturm (water level tower). Halfway up the tower, there is a water level indicator built into the wall, which gives the current condition of the tides.
Sieveking was from a well known Hamburg family. Many streets and places in Hamburg were named after them: e.g. Sievekingsallee, Sievekingdamm or Sievekingsplatz (53°33'19"N 9°58'34"E).
In 1951, Sieveking was appointed as the consul in Stockholm and later ambassador in Sweden. In 1953, Sieveking was the canditate of the conservative parties for the office of the First Mayor. He won the election, in his office term he reformed the school system and initiated the town twinning with Saint Petersburg (then Leningrad) in 1957. After the election defeat he remained member of the Hamburg Parliament.