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 region – the biggest contiguous fruit orchard in Central Europe – extends over 143 km2 (55 sq mi). 76.8% of the trees are apples, 12.7% are cherries. The areas closest to the Elbe are those with the highest population. They include the most fertile marshlands; towards the Geest the area connects to fens.
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.