Jisho

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Noun
1. inland sea; epicontinental sea; epeiric sea; marginal sea
Wikipedia definition
2. Marginal seaThe term marginal sea commonly has two differing meanings. As an oceanographic term, marginal sea indicates a partially enclosed sea adjacent to or widely open to the open ocean at the surface, but bounded by submarine ridges on the sea floor. As a geopolitical term, marginal sea is equivalent to territorial waters. Defining what naval territory falls under a state's jurisdiction as "marginal sea" is important in determining what maritime resources that state can exploit.
Read “Marginal sea” on English Wikipedia
Read “縁海” on Japanese Wikipedia
Read “Marginal sea” on DBpedia

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