Question: The municipality in which Vatnvatnet lies is part of what traditional region?
Context: The Municipality of Prebold (] ; Slovene: "Občina Prebold" ) is a small municipality in central Slovenia.  The seat of the municipality is Prebold.  The municipality lies on the edge of the lower Savinja Valley at the northern edge of the Sava Hills west of Celje.  The area was part of the traditional region of Styria.  The municipality is now included in the Savinja Statistical Region.  It is primarily known for growing hops. The Municipality of Dobrna (] ; Slovene: "Občina Dobrna" ) is a municipality in Slovenia.  It is best known for the spa town of Dobrna, which is also the seat of the municipality.  It lies north of Celje and east of Velenje in an area that was part of the traditional region of Styria.  The municipality is now included in the Savinja Statistical Region. Kandrše (] ; German: "Kandersche" ) is a settlement in the Municipality of Zagorje ob Savi in central Slovenia.  A small part of the settlement lies in the neighbouring Municipality of Litija.  The area is part of the traditional region of Upper Carniola.  The major part of the settlement is now included with the rest of the Municipality of Zagorje in the Central Sava Statistical Region. Bodø (] ; Lule Sami: "Bådåddjo" ) is a town and a municipality in Nordland county, Norway.  It is part of the traditional region of Salten and it is the capital of Nordland county.  The administrative centre of the municipality is the town of Bodø.  Other villages in Bodø include Misvær, Skjerstad, Saltstraumen, Løding, Løpsmarka, Kjerringøy, Sørvær, and Fenes. The Municipality of Braslovče (] ; Slovene: "Občina Braslovče" ) is a municipality in northern Slovenia.  The seat of the municipality is the town of Braslovče.  Most of the municipality, with the exception of the northern part of the village of Letuš, lies on the right bank of the Savinja River.  The area was part of the traditional region of Styria.  It is now included in the Savinja Statistical Region. Obrežje (] ) is a settlement in the Municipality of Radeče in central Slovenia.  It lies on the left bank of the Sava River and is thus part of the traditional region of Lower Styria, rather than Lower Carniola, where the rest of the municipality on the opposite bank of the river belongs.  The entire municipality is now included in the Lower Sava Statistical Region; until January 2014 it was part of the Savinja Statistical Region. The Municipality of Apače (] ; Slovene: "Občina Apače" ) is a municipality in Slovenia.  It lies in the traditional region of Styria in northeastern Slovenia and belongs to the Mura Statistical Region.  The municipality borders on the municipalities of Šentilj, Sveta Ana, and Gornja Radgona.  The Mura River is the border between Slovenia and Austria.  The seat of the municipality is the town of Apače.  The municipality was established in 2006 and split from the Municipality of Gornja Radgona on 1 January 2007. The Municipality of Dobrepolje (] ; Slovene: "Občina Dobrepolje" ) is a municipality in Slovenia.  It lies in a karst valley approximately 35 km south of the Slovenian capital Ljubljana.  The administrative centre of the municipality is in Videm.  The area was part of the traditional region of Lower Carniola.  The municipality is now included in the Central Slovenia Statistical Region. Vatnvatnet is a lake that lies in the municipality of Bodø in Nordland county, Norway.  The 4.71 km2 lake lies about 2 km north of the village of Løding.  The lake Heggmovatnet flows out into this lake. Kozje (] ) is a small town and a municipality in eastern Slovenia.  The settlement of Kozje lies in the centre of the municipality, 36 km from Celje, 107 km from Ljubljana, and 30 km from Rogaška Slatina.  It is the main settlement of the Kozje region (Slovene: "Kozjansko" ).  The area was part of the traditional region of Styria.  The municipality is now included in the Savinja Statistical Region.  It is one of the oldest settlements in the area, first mentioned in written documents dating to 1016.  It was granted market rights before 1384.
Answer: Salten