mer marginale

CONT: [...] entre l'arc et le continent, existe une «mer marginale» dont la croûte océanique est relativement récente : celle de la mer du Japon est d'âge éocène.
OBS: arc insulaire : alignement linéaire ou arqué d’îles volcaniques formées sur le fond marin à la limite de plaques convergentes.

CONT: Marginal seas, which separate coastal zones from open oceans, often exist as large indentations into continental landmasses. ... The primary differences between marginal seas and open oceans are associated with depth and proximity to landmasses. Marginal seas, which are generally shallower than open oceans, are more influenced by human activities, river runoff, climate, and water circulation.
OBS: Some of the major marginal seas include the Arabian Sea, Baltic Sea, Bay of Bengal, Bering Sea, Beaufort Sea, Black Sea, Gulf of California, Gulf of Mexico, Mediterranean Sea, Red Sea, Ross Sea, Weddell Sea, and all four of the Siberian Seas (Barents, Kara, Laptev, and East Siberian).