View source for Kattegat

==Boundaries==
[[File:Kattegat and Skagerrak border.png|thumb|Different definitions of the boundary between the Kattegat and the Skagerrak.]]
On 31 December 1932 Denmark, Norway and Sweden signed a convention regulating the fishing of [[European plaice]] in the Skagerrak, the Kattegat and [[Öresund|the Sound]]. There the Kattegat's boundary with the Skagerrak was defined a line from [[Skagen]] to [[Vinga Lighthouse]] and a line from there to the nearest point of [[Hisingen]], while the boundary with the Danish Straits was defined by two lines, one from Hasenøre to Gniben and one from Gilbjerg hoved to [[Kullen Lighthouse]].{{efn|Hasenøre is the southeastern tip of [[Djursland]], Gniben is the tip of [[Sjaellands Odde]] and Gilbjerg hoved is the tip of [[Sjaelland]].}}<ref>[http://treaties.un.org/doc/Publication/UNTS/LON/Volume%20139/v139.pdf Convention No 3210] {{Webarchive|url=https://web.archive.org/web/20160310035355/https://treaties.un.org/doc/Publication/UNTS/LON/Volume%20139/v139.pdf |date=10 March 2016}}. League of Nations Treaty Series 139, 1933–1934. Retrieved 19 April 2026.</ref> In the 3rd edition of the [[International Hydrographic Organization|International Hydrographic Organization's]] (IHO) [[Limits of Oceans and Seas]], published in 1953, the Kattegat is bundled together with the Danish Straits and this areas northern boundary was defined as a line from Skagen to the [[Pater Noster Lighthouse|Pater Noster Skerries]] (around {{convert|30.5|km|abbr=on}} north of Vinga)<ref name="MinKarta">{{Cite map|title=Min Karta|publisher=[[Lantmäteriet]]|trans-title=My Map|language=Swedish|url=https://minkarta.lantmateriet.se|access-date=20 April 2026}}</ref> and a line from there to [[Tjörn]].{{efn|No southern boundaries for the Kattegat were defined by the IHO due to the bundling with the Danish Straits.}}<ref>{{cite web |url=https://iho.int/uploads/user/pubs/standards/s-23/S-23_Ed3_1953_EN.pdf |title=Limits of Oceans and Seas |edition=3rd |year=1953 |publisher=[[International Hydrographic Organization]] |access-date=19 April 2026 |archive-url=https://web.archive.org/web/20111008191433/http://www.iho-ohi.net/iho_pubs/standard/S-23/S23_1953.pdf |archive-date=8 October 2011 |url-status=live}}</ref> [[HELCOM|HELCOM's]] definition has the northern boundary line running slightly further south than the IHO's does, stretching roughly from Skagen to the western tip of Klåverön (around {{convert|7.7|km|abbr=on}} south of Tjörn, and around {{convert|2.3|km|abbr=on}} south of [[Marstrand]]),<ref name="MinKarta"/> but the boundary is not a straight line between these two points, as it becomes jagged near the Swedish coast.<ref>{{Cite web |title=HELCOM Map and data service |url=https://maps.helcom.fi/website/mapservice/?datasetID=e5a59af9-c244-4069-9752-be3acc5dabed |access-date=20 April 2026 |website=[[HELCOM]]}}</ref> The [[International Council for the Exploration of the Sea]]'s definition of the Kattegat aligns with the 1932 convention in defining the southern boundaries, but has the northern boundary going from [[Skagen Lighthouse]] to [[Tistlarna Lighthouse]] (around {{convert|15.5|km|abbr=on}} south of Vinga)<ref name="MinKarta"/> and from there to the nearest point of the Swedish coast;<ref>{{Cite web |title=Atlantic, Northeast (Major Fishing Area 27) |url=https://www.fao.org/fishery/en/area/27#fao:27.3.a.21 |author=[[International Council for the Exploration of the Sea|ICES]] |url-status=live |access-date=19 April 2026 |website=[[Food and Agriculture Organization]]}}</ref> this results in [[Gothenburg]] being on the Skagerrak instead of the Kattegat.<ref name="MinKarta"/>