Nordaust-Svalbard Nature Reserve is located in the north-eastern part of the Svalbard archipelago in Norway. The nature reserve covers all of Nordaustlandet, Kong Karls Land, Kvitøya, Sjuøyane, Storøya, Lågøya, Wilhelmøya, Wahlbergøya and a small section of the north-east corner of Spitsbergen. The reserve is , of which is on land and is on water—making it the largest preserved area in Norway (including national parks). It includes the largest glacier in Norway, Austfonna, as well as and Vestfonna and parts of Olav V Land. The reserve has been protected since 1 July 1973 and borders in the south to Søraust-Svalbard Nature Reserve.