Franconian Switzerland (Fränkische Schweiz) is an upland in Upper Franconia, Bavaria, Germany and a popular tourist retreat. Located between the River Pegnitz in the east and the south, the River Regnitz in the west and the River Main in the north, its relief, which reaches 600 metres in height, forms the northern part of the Franconian Jura (Frankenjura). Like several other mountainous landscapes in the German-speaking lands, e.g. Holstein Switzerland, Märkische Schweiz, or Pommersche Schweiz, Franconian Switzerland was given its name by Romantic artists and poets in the 19th century who compared the landscape to Switzerland. Franconian Switzerland is famous for its high density of traditional breweries. The region was once called Muggendorfer Gebürg (Muggendorf hills). The first tourists arrived during the age of Romanticism. Two law students of Erlangen University, Ludwig Tieck and Wilhelm Heinrich Wackenroder have been credited as "discoverers" of the region. The "Eine Reise in die Fränkische Schweiz" issue of their joint production Franz Sternbalds Wanderungen (Berlin, 1798) enthralled many contemporaries. The 1820 book Die kleine Schweiz (Little Switzerland), written by Jakob Reiselsberger of Waischenfeld, gave the region its name. In 1829, a book by German salesman and local historian Joseph Heller, Muggendorf und seine Umgebung oder die Fränkische Schweiz (Muggendorf and its surroundings or Franconian Switzerland), was published. The description Switzerland was common during the 19th century for landscapes with mountains, valleys and, most significantly, rocks, e.g., Saxon Switzerland, Marcher Switzerland, Mecklenburg Switzerland and Holstein Switzerland. Franconian Switzerland is the northern part of the Franconian Jura. It is often loosely defined as the region bounded by the Main to the north, Regnitz to the west and Pegnitz to the east, or by the A 70 motorway to the north, the A 9 to the east and the A 73 to the west. However, the actual region of Franconian Switzerland is only the catchment area of the River Wiesent.