Островский район
On February 15, 1935, Soshikhinsky District was established on the parts of Ostrovsky and Slavkovsky Districts. The administrative center of the district was located in the "selo" of Vorontsovo. Between March 22, 1935 and September 19, 1940, Soshikhinsky District was a part of Pskov Okrug of Leningrad Oblast. Between August 1941 and July 1944, Soshikhinsky District was occupied by German troops. On August 23, 1944, the district was transferred to newly established Pskov Oblast. On October 3, 1959 the district was abolished and split between Ostrovsky and Novorzhevsky Districts. After the administrative reforms of the 1960s, the whole of the former Soshikhinsky District was transferred to Ostrovsky District.