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After a bloodless revolution on 6 September 1885, the province was annexed by the Principality of Bulgaria, which was de jure a tributary state but de facto functioned as independent nation.
According to the Treaty of Berlin after the Liberation of Bulgaria in 1878 the region was included in the autonomous region Eastern Rumelia which united with the Principality of Bulgaria on 6 September 1885.
The feature was named after the Bulgarian town of Saedinenie (‘Reunification’), in association with the 120th anniversary of the Reunification of the Principality of Bulgaria and the province of Eastern Rumelia in 1885.
Saedinenie Snowfield on Livingston Island in the South Shetland Islands, Antarctica is named the town of Saedinenie in association with the 120th anniversary of the Reunification of the Principality of Bulgaria and the province of Eastern Rumelia in 1885.