Freiburg im Breisgau is a city in Baden-Württemberg, Germany, in the Breisgau region, on the western edge of the southern Black Forest (German: Schwarzwald) with about 214,000 inhabitants. Popular opinion has it that Freiburg is the warmest city in Germany. It straddles the Dreisam river, on the foothills of the Schlossberg. The city is surrounded by the Black Forest mountains Rosskopf and Bromberg in the east, and in the south and west by the Schönberg, Tuniberg and the Kaiserstuhl. Because of its scenic beauty, relatively warm and sunny climate and easy access to the Black Forest, Freiburg is a hub for regional tourism. The longest cable car run in Germany, which is 3.6 km, or about 2.25 miles long runs from Gunterstal up to a nearby mountain called Schauinsland. The city has an unusual system of gutters (called Bächle) that run throughout its centre. These Bächle, once used to provide water to fight fires and feed livestock, are constantly flowing with water diverted from the Dreisam. These Bächle were never used for sewage, as such usage could lead to harsh penalties, even in the Middle Ages. It is said that if you step in a Bächle, you will marry a Freiburger, or 'Bobbele'. The Augustinerplatz is one of the central squares in the old city. Formerly the location of an Augustine monastery which became the Augustinermuseum in 1921, it is now a popular social space for Freiburg's younger residents. It has quite a few restaurants and bars, including the local brewery 'Feierling', which has a nice Biergarten. On warm summer nights, of which there are many, hundreds of students will gather and enjoy guitar music and socialize.