The harbour of Sulna, Romania according to a CIA report dated 4 November 1955

An item dealing with the Romanian Danube harbours reported that in the harbour of Sulina on the north river bank a small dockyard existed where at the moment a tug and a dredger were under repair.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008300620005-0