The Bulgarian merchant sea port Pomorie according to an American CIA report dated 7 April 1954

An item reported that the merchant harbour Pomorie, on a peninsula in the Burgas Bay, Bulgarian Black Sea Coast was used for handling small tonnage vessels. At the end of 1950 were civilians not allowed to enter a large section of land around the harbour.

Source
The report was published on www.archive.org, document number CIA-RPD80-00810A000500340010-8.