The areas on the north and southwest are rich with marine resources and it is considered economically important because minerals, natural gas as well as small amount of petroleum and methane hydrate are also available.
北方と南西海域は豊富な水産資源が得られ、鉱物資源や天然ガス、わずかながら石油そしてメタンハイドレートの存在など経済的にも重要な海域とされる。