From the Wikipedia page 
Solovetsky District (Russian: Солове́цкий райо́н) is an administrative district (raion), one of the twenty-one in Arkhangelsk Oblast, Russia. It is located on the Solovetsky Islands archipelago in the White Sea. Its administrative center is the rural locality (a settlement) of Solovetsky.
Administratively, Solovetsky District is unique in Arkhangelsk Oblast because it cannot be transformed in any way other than merging it into Primorsky District as a selsoviet. Municipally, the district is incorporated as Solovetskoye Rural Settlement within Primorsky Municipal District.