Gēnjù guójìfǎ, lǐnghǎi kuāndù tōngcháng wéi shí'èr hǎilǐ.
Under international law, territorial waters typically extend twelve nautical miles.
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领海 is the 12-nautical-mile band where a state has full sovereignty — distinct from 专属经济区 (Exclusive Economic Zone, 200 nm) and 公海 (high seas). The same 领 ('to lead, to own as territory') appears in 领空 (airspace) and 领土 (territory).