We found one dictionary that defines the word submerged coastal plain:

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1. submerged coastal plain: Encyclopedia

▸ Words similar to submerged coastal plain ▸ Usage examples for submerged coastal plain ▸ Idioms related to submerged coastal plain ▸ Wikipedia articles (New!) ▸ Words that often appear near submerged coastal plain ▸ Rhymes of submerged coastal plain ▸ Invented words related to submerged coastal plain