What is Vättern?
{{Infobox lake |lake_name = Vättern |image_lake = Swedish sauna on the lake.jpg |caption_lake = [[Sauna]] on the lake, picture taken from [[Karlsborg]] |image_bathymetry = |caption_bathymetry = |coords = {{Coord|58|24|N|14|36|E|region:SE_type:waterbody_scale:2000000|display=inline,title}} |type = |inflow = |outflow = [[Motala ström]] |catchment = {{convert|4503|km2|abbr=on}} |basin_countries = Sweden |length = |width = |area = {{convert|1912|km2|abbr=on}}<ref name=Sepp2005/> |depth = {{convert|41|m|abbr=on}}<ref name=Sepp2005/> |max-depth = {{convert|128|m|abbr=on}}<ref name=Sepp2005/> |volume = {{convert|77.0|km3|abbr=on}}<ref name=Sepp2005/> |residence_time = |shore = |elevation = {{convert|88|m|abbr=on}}<ref name=Sepp2005/> |islands = [[Visingsö]] |cities = [[Vadstena]], [[Jönköping]], [[Hjo]], [[Askersund]], [[Åmmeberg]], [[Karlsborg]] |reference = <ref name=Sepp2005>{{Cite book| last=Seppälä| first=Matti| title=The Physical Geography of Fennoscandia | url=https://books.google.com/books?id=q33WekTp7tgC&pg=PA145| publisher=Oxford University Press|year=2005| isbn=978-0-19-924590-1| page=145}}</ref> }} [[File:Lake Vättern.png|thumb|Vättern]] '''Vättern''' is the second biggest [[lake]] in [[Sweden]]. The lake's total surface [[area]] is about {{convert|1912|km2|sqmi|lk=on|abbr=on|0}} . The deepest known point is {{convert|128|m|ft|lk=on|abbr=on|0}}. The average depth of the lake is {{convert|40|m|ft|abbr=on|0}}. Vättern is famous for the quality of its [[transparent]] [[water]]. Many of the people living in the area get their drinking water directly from Vättern. The lake water does not need to have many things done to it before it is used in nearby [[city|cities]] and [[town]]s. The water can be safely drunk from almost any point in the lake. It has been said that Vättern is the largest body of [[wikt:potable|potable]] water in the world. Vättern is also noted for its [[fishing]]. [[Tourism|Tourist]] [[sport]] fishermen and people on [[vacation]] are allowed to fish in the lake as long as they do not