Question: The municipality in which Vatnvatnet lies is part of what traditional region?

full_context: Document 1: Trondheim: Trondheim (] ), historically Kaupangen, Nidaros and Trondhjem, is a city and municipality in Sør-Trøndelag county, Norway. It has a population of 187,353 (January 1, 2016), and is the third most populous municipality in Norway, although the fourth largest urban area. It is the third largest city in the country, with a population (2013) of 169,972 inhabitants within the city borders. The city functions as the administrative centre of Sør-Trøndelag county. Trondheim lies on the south shore of Trondheim Fjord at the mouth of the River Nidelva. The city is dominated by the Norwegian University of Science and Technology (NTNU), the Foundation for Scientific and Industrial Research (SINTEF), St. Olavs University Hospital and other technology-oriented institutions.
Document 2: Rekvatnet: Rekvatnet (Lule Sami: "Goajvojávrre" ) is a lake in the municipality of Hamarøy in Nordland county, Norway. The lake lies about 15 km southeast of the village of Tømmerneset. The lake Šluŋkkajávri lies just to the east of the lake. The water from Rekvatnet is piped downhill to a hydroelectric power station on the shores of the lake nearby, Lake Fjerdvatnet.
Document 3: Sandnesvatnet: Sandnesvatnet (Lule Sami: "Sáttonjárgjávrre" ) is a lake in the municipality of Hamarøy in Nordland county, Norway. The European route E06 highway runs along the eastern and northern shores of the lake. The lake lies about 5 km southeast of the village of Tømmerneset. The lake Strindvatnet lies just to the northwest and the lake Fjerdvatnet lies to the south of the lake.
Document 4: Tromsø: Tromsø (] ; Northern Sami: "Romsa" ; Finnish: "Tromssa" ; Kven: "Tromssa" ) is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø. Outside of Norway, "Tromso" and "Tromsö" are alternative spellings of the city. Tromsø town has a population of 64,376 as of 1 January 2016. The most populous town north of it is Alta, Norway, with a population of 14,272 (2013).
Document 5: Veresvatnet: Veresvatnet or Veressjøen is a lake in the municipality of Verdal in Nord-Trøndelag county, Norway. The lake lies in the eastern part of the municipality, just west of the border with Sweden and just south of Blåfjella–Skjækerfjella National Park. The 6.5 km2 lake sits at an elevation of 360 m above sea level, and it is considered to be one of the headwaters of the Verdalselva river since the lake's water flows out into the river Helgåa which later joins the Verdalselva. The village of Vera and the Vera Chapel lie on the northern shores of the lake.
Document 6: Sula, Møre og Romsdal:    is a municipality in Møre og Romsdal county, Norway. It is part of the Sunnmøre district. The administrative centre is the village of Langevåg. Other villages include Solevåg, Fiskarstrand, Veibust, Leirvågen, and Mauseidvågen. Sula is one of the most densely populated municipalities in Møre og Romsdal county, and it is part of the Ålesund Region since it is just south of the city of Ålesund. The municipality encompasses the island of Sula and the many small surrounding islets.
Document 7: Røros:    (Southern Sami: "Plassje" ) is a town and municipality in Sør-Trøndelag county, Norway. It is part of the Gauldalen region. The administrative centre of the municipality is the town of Røros. Other villages include Brekken, Glåmos, Feragen, Galåa, and Hitterdalen.
Document 8: Juvatn: Juvatn or Gjuvvatnet is a lake in the municipality of Åseral in Vest-Agder county, Norway. The 8.06 km2 lake lies on the river Logna in the upper part of the Mandalen valley. The lake is in the far northeastern part of the municipality, just over 1.2 km south of the border with Bygland municipality in Aust-Agder county. The Bortelid ski area lies just west of the lake. There is a dam on the southern part of the lake to use the water as part of a hydro-electric power system in the region. The dam was built in 1958 as part of the Logna power system. The water ultimately flows into the river Mandalselva. The nearby lake Gyvatn lies about 8 km southeast of Juvatn.
Document 9: Ålesund: Ålesund (] ) is a town and municipality in Møre og Romsdal county, Norway. It is part of the traditional district of Sunnmøre, and the center of the Ålesund Region. It is a sea port, and is noted for its concentration of Art Nouveau architecture.
Document 10: Bergen: Bergen, historically Bjørgvin, is a city and municipality in Hordaland on the west coast of Norway. At the end of the first quarter of 2016 , the municipality's population was 278,121, and the Bergen metropolitan region has about 420,000 inhabitants. Bergen is the second-largest city in Norway. The municipality covers 465 km2 and is on the peninsula of Bergenshalvøyen. The city centre and northern neighbourhoods are on Byfjorden, 'the city fjord', and the city is surrounded by mountains; Bergen is known as the 'city of seven mountains'. Many of the extra-municipal suburbs are on islands. Bergen is the administrative centre of Hordaland and consists of eight boroughs—Arna, Bergenhus, Fana, Fyllingsdalen, Laksevåg, Ytrebygda, Årstad and Åsane.
Document 11: Bodø: 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.
Document 12: Vatnvatnet: 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.
Document 13: Røssvatnet: Røssvatnet (Southern Sami: "Reevhtse" ) is a lake and reservoir in the municipalities of Hattfjelldal and Hemnes in Nordland county, Norway. It has been the site of human occupation since the Stone Age. Its area of 219 km2 makes it the second largest lake in Norway by surface area. Without the dam which has regulated the lake since 1957, it would be 190 km2 and the third largest lake in Norway. Its depth is 240 m , its volume is estimated at about 15 km3 , and its surface elevation is 374 m above sea level.
Document 14: Northern Norway: Northern Norway (Bokmål: "Nord-Norge" , Nynorsk: "Nord-Noreg" , Northern Sami: "Davvi-Norga" ) is the geographical region of Norway, consisting of the three northernmost counties Nordland, Troms and Finnmark, in total about 35% of the Norwegian mainland. Some of the largest towns in Northern Norway (from south to north) are Mo i Rana, Bodø, Narvik, Harstad, Tromsø and Alta. Northern Norway is often described as the land of the midnight sun and the land of the northern lights. Further north, halfway to the North Pole, is the Arctic archipelago of Svalbard, traditionally not regarded as part of Northern Norway.
Document 15: Vatnestrøm: Vatnestrøm is a village in Iveland municipality in Aust-Agder county, Norway. The village is located along the Norwegian County Road 405, on the western shore of the lake Ogge. The municipal centre of Birketveit lies about 12 km to the northwest and the village of Oggevatn in the neighboring municipality of Birkenes lies about 6 km to the northeast.
ground_truth: Salten