The Romanian port of Constanța is the largest port on the Black Sea.

Omissions

• Sources were not able to be matched to a single primary statistical authority (Eurostat/national statistics office) for a Black Sea-wide ranking; the corroboration comes from industry and terminal-operator sources rather than an official ranking.
• The main competitor, Novorossiysk (Russia), is frequently reported as the largest Black Sea port by total cargo tonnage, a context omitted by the claim.
• Constanța's cargo throughput declined from a 92.6 million tonne record in 2023 to about 67 million tonnes in 2025, a downward trend not reflected in the claim.
• The exact superlative is a contested/self-promotional industry framing rather than an officially published statistical ranking.

Sources

• SecondaryDP World — Constanța Port OperationsThe largest port on the Black Sea, Constanța port brings together on-dock rail and barge, a rapid Ro-Ro route to Turkey...
• SecondaryPortsEurope Newsletter (30 July 2025)It is the largest port in the Black Sea and one of Europe's busiest by cargo volume. almost 2 billion euro (1.93 billion), cargo throughput
• Secondarygettransport.com — Biggest Black Sea Ports 2026Black Sea port ranking 2026: Constanta 67m tonnes in 2025 (from a 92.6m record in 2023), Novorossiysk 36.8m in Q1 2026, Ukrainian corridor