Today, we know what the Black Sea is not from a strategic perspective, but we do not know what it is. This strategic indecision is the explanation for all the conflicts, frozen or not, explicit or tacit, and all the political and geopolitical tensions that are now taking place in this space and that are becoming endemic. The story of the Black Sea continues…This text is the first encyclopaedia explicitly dedicated to the geopolitics of the Black Sea, written for Western audiences, an academic research which appeals to the wider academic community, PhD students, professors, and researchers, and to any reader interested in geopolitics, history, international relations, economy, sociology, history, and geography.