Question: What does Christoph Eichhorn's birthplace share a border with?

full_context: Document 1: Julia Eichhorn: Julia Eichhorn (born July 11, 1983) is a German skeleton racer who has competed since 1999. Her best Skeleton World Cup finish was fifth at Königssee in February 2007.
Document 2: Stellihorn: The Stellihorn is a mountain of the Swiss Pennine Alps, overlooking the lake of Mattmark in the canton of Valais. It lies south of Saas-Almagell in the upper valley of Saas. The north side is covered by a glacier named "Nollen Gletscher".
Document 3: Karl Friedrich Eichhorn: Eichhorn was born in Jena as the son of Johann Gottfried Eichhorn. He entered the University of Göttingen in 1797. In 1805 he obtained the professorship of law at Frankfurt (Oder), holding it till 1811, when he accepted the same chair at the new Friedrich Wilhelm University in Berlin. On the call to arms in 1813 he became a captain of horse, and received the Iron Cross at the end of the war.
Document 4: Christoph Eichhorn: Christoph Eichhorn (born 8 September 1957, in Kassel, Germany) is a German television actor and director. He is the son of German actor Werner Eichhorn.
Document 5: Hesselberg: Hesselberg (689 m above sea level) is the highest point in Middle Franconia and the Franconian Jura and is situated 60 km south west of Nuremberg, Germany. The mountain stands isolated and far from the center of the Franconian Jura, in its southwestern border region, 4 km to the north west of Wassertrüdingen. The mountain's first recorded name was "Öselberg", which probably derived from "öder Berg" (bleak mountain). This name later changed to "Eselsberg" and finally to the current name "Hesselberg". As a butte the mountain provides an insight into Jurassic geology. It has also witnessed an eventful history, many incidents were handed down from generation to generation and these mixed with facts have become legends. Nowadays many people visit Hesselberg in order to enjoy nature and the wonderful vista. When the weather is clear the Alps 150 km away can be seen.
Document 6: Stellbergsee: Stellbergsee is a lake in Söhre, Landkreis Kassel and Schwalm-Eder-Kreis, Hesse, Germany. At an elevation of 356 m, its surface area is 0.014 km².
Document 7: Alatsee: Alatsee is a meromictic lake in Ostallgäu, Bavaria, Germany. At an elevation of 868.0 m, its surface area is 12.00 ha. This lake supposedly holds "Hitler's gold". Many divers have died or disappeared mysteriously in this lake due to the toxicity of the organisms living in this lake. These organisms create the "blood cloud " that occurs quite abundantly throughout the year.
Document 8: Thomas Ohrner: Thomas Ohrner was born on 3 June 1965 in Munich, Germany, the son of actress Evelin Bey-Ohrner and economic adviser Claus Peter Ohrner. He has two older siblings, a half-sister, actress , born in 1961, and a brother, Markus Ohrner, born in 1963. At the age of eight months, Ohrner began as a child model, appearing in print advertorial campaigns for baby carriages, margarine and detergent, and by the age of four, he was appearing in television commercials.
Document 9: Emil Eichhorn: Emil Eichhorn (9 October 1863 - 26 July 1925) was a USPD politician and Chief of the Berlin Police during the 1918–1919 German Revolution.
Document 10: Michael Kehlmann: Michael Kehlmann (21 September 1927 – 1 December 2005) was an Austrian television film director and theatre director, screenwriter and actor. He was the father of writer Daniel Kehlmann.
Document 11: Seeberg: Seeberg is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. The lake Burgäschisee is located on the border with Aeschi. On 1 January 2016 the former municipality of Hermiswil merged into Seeberg.
Document 12: Eric Eichmann: Eric Eichmann (born May 7, 1965, in Margate, Florida) is a retired American soccer player. He played professionally in Germany and the United States and later served as an assistant coach with the Miami Fusion of Major League Soccer. He also earned twenty-nine caps and scored four goals, for the United States men's national soccer team.
Document 13: Kurt Hoffmann: Kurt Hoffmann (12 November 1910 – 25 June 2001) was a German film director, the son of Carl Hoffmann. He directed 48 films between 1938 and 1971.
Document 14: Sweden: At 449,964 km2 (173,732 sq mi), Sweden is the 55th-largest country in the world, the 4th-largest country entirely in Europe, and the largest in Northern Europe. The lowest elevation in Sweden is in the bay of Lake Hammarsjön, near Kristianstad, at −2.41 m (−7.91 ft) below sea level. The highest point is Kebnekaise at 2,111 m (6,926 ft) above sea level.
Document 15: Schermützelsee: The Schermützelsee is a lake in Brandenburg, Germany. It is located in the town of Buckow in the district Märkisch-Oderland northwest of Müncheberg and east of the Berlin centre. With its surface area of 1.37 km² it is the largest water in the hill country „Märkische Schweiz“ and in the Märkische Schweiz Nature Park.
ground_truth: Schwalm-Eder-Kreis
sub_queries: Christoph Eichhorn >> place of birth Answer: Kassel
Kassel >> shares border with Answer: Schwalm-Eder-Kreis