question: The Höllental (English translation: Hell's Valley) in the Black Forest is a deep valley - in places like a gorge - in the state of Baden-Württemberg in Germany, the valley, which is about 9 km long, is located in the southern part of the Southern Black Forest Nature Park about 18 km southeast of which city in Baden-Württemberg, Germany with a population of about 220,000?
answer: Freiburg im Breisgau
context: Title: Ravenna Bridge
  Passage: The Ravenna Bridge is a 58 m high and 225 m long railway viaduct on the Höllental Railway line in the Black Forest, in Breitnau, Breisgau-Hochschwarzwald, Baden-Württemberg, Germany.  The bridge crosses the Ravenna Gorge that ends in the upper Höllental valley, and has a grade of 12 m .  The origin of the name most likely comes from the French "ravin" for gorge.
  Title: Southern Black Forest Nature Park
  Passage: The Southern Black Forest Nature Park (German: "Naturpark Südschwarzwald" ) covers an area of 394,000 hectares and is, at present, the largest nature park in Germany.
  Title: Höllental (Black Forest)
  Passage: The Höllental (English translation: Hell's Valley) in the Black Forest is a deep valley - in places like a gorge - in the state of Baden-Württemberg in Germany.  The valley, which is about 9 km long, is located in the southern part of the Southern Black Forest Nature Park about 18 km southeast of Freiburg im Breisgau between Hinterzarten and Buchenbach-"Himmelreich".  The "Rotbach" stream (also called "Höllenbach" in the upper Höllental) runs through the valley.  "Hölle" is the German word for "hell".  In the narrow, dark valley, travellers almost felt like moving underground.  The valley was the locale of the Battle of Emmendingen in 1796, part of the French Revolutionary Wars.
  Title: Freiburg im Breisgau
  Passage: Freiburg im Breisgau (] ; Alemannic: "Friburg im Brisgau" [ˈfʁiːb̥əɡ̊] ; French: "Fribourg-en-Brisgau" ) is a city in Baden-Württemberg, Germany with a population of about 220,000.  In the south-west of the country, it straddles the Dreisam river, at the foot of the Schlossberg.  Historically, the city has acted as the hub of the Breisgau region on the western edge of the Black Forest in the Upper Rhine Plain.  A famous old German university town, and archiepiscopal seat, Freiburg was incorporated in the early twelfth century and developed into a major commercial, intellectual, and ecclesiastical center of the upper Rhine region.  The city is known for its medieval minster and Renaissance university, as well as for its high standard of living and advanced environmental practices.  The city is situated in the heart of the major Baden wine-growing region and serves as the primary tourist entry point to the scenic beauty of the Black Forest.  According to meteorological statistics, the city is the sunniest and warmest in Germany and held the all-time German temperature record of 40.2 °C from 2003 to 2015.
citations: Freiburg im Breisgau Höllental (Black Forest)