Torneträsk or Torne träsk (Swedish: [toːɳɛˈtrɛsːk];^[2] Saami: Duortnosjávri; Finnish and Meänkieli: Tornio or Torniojärvi) is a lake in Kiruna Municipality, Lapland, Norrbotten County in Sweden, in the Scandinavian Mountains. Träsk is the local word for lake (in Standard Swedish it means "swamp"). It is the sixth-largest lake in Sweden, with a total area of 330 square kilometres (130 square miles) and a length of 70 kilometres (43 miles). The lake drains to the south-east through Torne river. South-west of the lake lies the Abisko National Park and the UNESCO World Heritage Site Laponian area.

You can help expand this article with text translated from the corresponding article in Swedish. (November 2014) Click [show] for important translation instructions. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Swedish Wikipedia article at [[:sv:Torneträsk]]; see its history for attribution. You should also add the template {{Translated|sv|Torneträsk}} to the talk page. For more guidance, see Wikipedia:Translation.

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Torneträsk
Torneträsk (Swedish) Duortnosjávri (Northern Sami) Torniojärvi (Meänkieli)
Duortnosjávri (Northern Sami)
Torneträsk seen from the north
Torneträsk Show map of Sweden Torneträsk Show map of Norrbotten
Location	Kiruna Municipality, Norrbotten County
Coordinates	68°22′N 019°06′E
Primary inflows	• nameless flow from a little glacier south of lake Válfojávri (Nordland, Norway)  → river Válfojohka  → lake Gamajávri  → river Kamajåkka  → lake Abiskojaure  → river Abiskojåkka • river Njuoreatnu • river Rágeseatnu • lake Koojärvi  → river Stalojåkka • river Nakerijoki • river Sarvájohka • river Bessešjohka
Primary outflows	Torne River
Basin countries	Sweden
Max. length	70 km (43 mi)
Max. width	11 km (6.8 mi)
Surface area	332 km2 (128 sq mi)
Average depth	51 m (167 ft)
Max. depth	168 m (551 ft)
Water volume	17.1 km3 (13.9×10^6 acre⋅ft)
Surface elevation	341 m (1,119 ft)
References	[1]

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Torneträsk originated from the remnant of a glacier, which has given the lake its depth of 168 metres (551 feet), making it the second-deepest lake in Sweden. It is usually ice-covered from December through June, with variations dependent on temperature variations.

Permafrost is common in the land around the lake. This low elevation permafrost is disappearing because of global warming and increased snowfall.^[3]

During the 1944 Operation Obviate of WWII, British bombers seeking to destroy the German battleship Tirpitz had their rendezvous over Torneträsk, in violation of Swedish neutrality.