Rostojávri (Northern Sami), Råstojaure (Swedish), or Store Rostavatn (Norwegian) is a lake on the border between Norway and Sweden. The Norwegian side of the lake is located in Målselv Municipality in Troms county and the Swedish side of the lake is located in Kiruna Municipality in Norrbotten County. The Norwegian part of the lake lies inside Øvre Dividal National Park. The lake lies at an elevation of 680 metres (2,230 ft) and covers a total area of 34.24 square kilometres (13.22 sq mi); with 3.67 square kilometres (1.42 sq mi) located in Norway and the remaining 30.57 square kilometres (11.80 sq mi) are located in Sweden.

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Rostojávri (Northern Sami) Råstojaure (Swedish) Store Rostavatn (Norwegian)
Rostojávri Show map of Troms Rostojávri Show map of Norway Rostojávri Show map of Sweden
Location	Kiruna, Norrbotten and Målselv, Troms
Coordinates	68.8213°N 20.2794°E / 68.8213; 20.2794
Basin countries	Sweden and Norway
Max. length	16 kilometres (9.9 mi)
Max. width	4 kilometres (2.5 mi)
Surface area	34.24 km2 (13.22 sq mi)
Surface elevation	680 metres (2,230 ft)
References	NVE

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The lake straddles two watersheds. To the northwest it drains into the river Rostaelva, a tributary of the river Målselva, which runs into the Atlantic Ocean. To the southeast it drains into the Rostoeatnu, a source river of the Lainio, itself a tributary of the Torne, which drains into the Bothnian Bay of the Baltic Sea.^[1]