Nature de ce terrain
The Baltic is a shallow, nearly enclosed sea whose only connection to the ocean runs through the Danish straits. Since 2024 every coastline on it is allied territory except Russia’s at Kaliningrad and around St Petersburg — a change of geography by accession rather than by movement.
Confiance : élevée Au 2026-09Revu le 2026-09-28
Où les mouvements se concentrent
Where the sea narrows towards the Danish straits. It is a chokepoint in the plain geographic sense — a place everything entering or leaving the Baltic by ship passes near — and this record says nothing about who passes, when, or on what terms.
Caractère physique
- Terrain dominant
- Des eaux peu profondes partout au regard des normes océaniques, avec de vastes archipels au large de la Suède et de la Finlande, des côtes basses et sablonneuses au sud et à l’est, et des fonds marins traversés par les câbles et les gazoducs qui relient les États riverains. Les détroits danois, à l’extrémité ouest, sont étroits, peu profonds et très fréquentés.
- Implications pour la mobilité
- Tout ce qui entre dans la mer ou en sort par navire passe par les détroits. À l’intérieur de la mer, les distances sont courtes et les ports nombreux, ce qui rend la liaison maritime entre les moitiés nord et sud de ce théâtre praticable d’une manière que la liaison terrestre ne l’est pas. Les infrastructures sous-marines sont denses, et ce sont elles qui expliquent la présence de ces eaux dans ce module.
- Contraintes saisonnières
- La glace se forme dans les golfes septentrionaux la plupart des hivers et parfois plus au sud, ce qui contraint la navigation de façon saisonnière sans fermer la mer.
- Eau et obstacles naturels
- The Danish straits — the Sound and the two Belts — are the barrier and the entrance at once, and their passage regime is governed by a nineteenth- century treaty and by Danish law rather than by any alliance arrangement. Inside the sea the Gulf of Finland, the Gulf of Riga and the Gulf of Gdańsk are the three enclosed waters the module marks, and the Gulf of Finland is where most of the recorded infrastructure damage sits.
- Urbanisation et peuplement
- The coasts are among the most urbanised in the theatre: Copenhagen, Stockholm, Helsinki, Tallinn, Riga, Gdańsk and St Petersburg all sit on this sea, and the ports of the eastern coast are the entry points the logistics record names. The coast is populated country, and the seabed assets are civilian ones.
Portée opérationnelle générale
The enclosure is the point: a sea with one entrance, shallow water, dense infrastructure on its floor and allied coasts almost all the way round is a different strategic object from an open ocean. Four published facts organise it. Finland's accession in April 2023 and Sweden's in March 2024 closed the last non-allied coastlines except Russia's. Damage to cables and pipelines on the seabed has recurred since September 2022 — Nord Stream, Balticconnector, Estlink 2 — and in every case damage, suspected interference and state attribution remain three separate claims, none of which has reached a state. NATO launched Baltic Sentry on 14 January 2025 after a meeting of Baltic Sea Allies in Helsinki, deploying frigates, maritime patrol aircraft and naval drones to watch the infrastructure it does not own. And the same water carries the shadow-fleet tankers whose boarding and detention by flank states is the enforcement question the module's economy layer records without counting. Opposite, the Baltic Fleet's principal base at Baltiysk is publicly known; what is in it is not published and is not carried here. This record describes that geography. It publishes no cable or pipeline route, no landing station, no patrol area, no transit corridor and no assessment of access.
Observé
Allied coastline on every shore except Russia's since March 2024; Baltic Sentry running since January 2025; confirmed physical damage to named Baltic assets on nine occurrence days since September 2022, per the module's civil-resilience count; the Baltic Fleet's principal base at Baltiysk publicly documented; Multinational Division North seated at Ādaži and Karup on the sea's eastern and western shores.
Évalué
Accession changed who owns the shore and not what lies on the seabed, which is why the sea's exposure did not change in 2024 while its politics did. The vigilance activity changes the probability that behaviour is observed, not the vulnerability of a single cable; the module keeps those two things apart everywhere it mentions them.
« Observé » désigne ce que montrent les sources. « Évalué » désigne la lecture qu’en fait Vigil, assortie du degré de confiance de cette fiche.
Forces liées à ce terrain
Dérivé des liens de localisation propres aux organisations vers les repères de cette fiche — la relation que chacune déclare, jamais une position.
Logistics through this ground
Lieux de ce terrain
Pertinence pour les campagnes
Ce qui reste inconnu
- No cable, pipeline or interconnector route, landing station or repair arrangement is described here, by design, and none may be added.
- Whether the standing naval forces contribute to Baltic Sentry, and which Allies contribute what, is not published.
- Nothing here describes the Baltic Fleet's vessels, strength or activity; Baltiysk is linked as a published base and nothing more.
- Shadow-fleet enforcement actions are reported in two classes — at-sea interventions and in-port detentions — that public reporting mixes, and no aggregator publishes either; this record carries no count.
Si un dossier d’infrastructure balte aboutit à une attribution à un État
None has. The first would change what the damage series is understood to be, and it is the single most consequential open question about this water.
Whether Baltic Sentry's contributions or duration are published
NATO names asset classes and not units, numbers or an end date. A published contribution list would be a change in disclosure practice.
The passage regime through the Danish straits
Governed by treaty and Danish law. Any published change to how shadow-fleet vessels are treated in the straits is a legal and enforcement fact, and it is where this sea's enclosure becomes practical.
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Évalué au — 2026-09 Dernière revue — 2026-09-28