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a: the region above the -10 m isobath between the N. Channel and N. Passage; b: the region above the -10 m isobath between the N. and S. Passages; c: the region of the Nanhui Shoal and S. Passage above the -10 m isobath; d: the seaward region below the -10 m isobath; e: the entire submerged delta; The red line shows the demarcation between the pre-TGD and post-TGD eras.
