The Feldsee (also "Feldbergsee") is a lake in southern Baden-Württemberg at the foot of the Feldberg east of Freiburg im Breisgau in Germany.
 It is part of the Southern Black Forest Nature Park.
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.
The Black Forest National Park (German: Nationalpark Schwarzwald ) was created on 1 January 2014 and is the first national park in Baden-Württemberg, Germany.
 The state parliament voted for its establishment on 28 November 2013.
 The national park has an area of 10062 ha and is located on the main crest of the Northern Black Forest, mainly between the Black Forest High Road ("Schwarzwaldhochstraße") and the valley of the Murg.
 It comprises two separate areas, roughly 3.5 kilometres apart, around Ruhestein (7,615 ha) and Hoher Ochsenkopf/Plättig (2,447 ha) and is part of the Central/North Black Forest Nature Park ("Naturpark Schwarzwald Mitte/Nord").
 The park was officially opened on 3 May 2014
The Southern Black Forest (German: "Südschwarzwald" ) refers to the highest part of the Black Forest which was heavily transformed by ice age glaciation south of a line roughly from Freiburg im Breisgau to Donaueschingen.
 The term High Black Forest is not quite identical; that usually includes the highest part of the Central Black Forest, southeast of the Elz valley, as well.
 The Southern Black Forest Nature Park ("Naturpark Südschwarzwald") also takes in this area, extending across the whole of the High Black Forest as well as several peripheral areas.
The Baden Black Forest Railway (German:Badische Schwarzwaldbahn) is a twin-track, electrified railway line in Baden-Württemberg, Germany, running in a NW-SE direction to link Offenburg on the Rhine Valley Railway ("Rheintalbahn") with Singen on the Upper Rhine Railway ("Hochrheinbahn").
 Passing directly across the Black Forest, through spectacular scenery, the route is 150 km long, ascends 650 metres from lowest to highest elevation, and passes through 39 tunnels and over 2 viaducts.
 It is still the only true mountain railway in Germany to be built with two tracks, and is the most important railway line in the Black Forest.
 It was built between 1863 and 1873, utilizing plans drawn up by Robert Gerwig.
The Sulgener Berg, also called the Sulger Berg, is a mountain,  sea level (NHN) ,<includeonly></includeonly> in the Black Forest in Germany.
 It is located near Sulgen (also on the "Sulgen"), a village in the borough of Schramberg in the Baden-Württemberg county of Rottweil.
 It lies within the Central/North Black Forest Nature Park.
The Ravenna Gorge (German: "Ravennaschlucht" ) is a gorge in the Black Forest in southwest Germany.
 It is a narrow side valley of the Höllental, through which the Ravenna stream flows.
 A trail also runs through the ravine as part of the Black Forest Homeland Path ("Heimatpfad Hochschwarzwald").
 The roughly four-kilometre-long gorge runs from the Höllental up to the village of Breitnau on the plateau and lies within its municipal boundaries.
 The name of the gorge is probably derived from the French word "ravine" which means "gorge".
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.
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.
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.

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