Søraust-Svalbard Nature Reserve is located in the south-eastern part of the Svalbard archipelago in Norway. The nature reserve covers all of Edgeøya and Barentsøya in addition to a number of smaller islands, including Tusenøyane, Ryke Yseøyane and Halvmåneøya. The reserve is , of which is on land and is on water—making it the second-largest preserved area in Norway (including national parks). The reserve has been protected since 1 July 1973 and borders in the south to Nordaust-Svalbard Nature Reserve.