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United kingdom–united states border

international maritime border

Pronunciation
/juːˈnʌɪtɪd ˈkɪŋdəm – juːˈnʌɪtɪd steɪts ˈbɔːdə/
/juˈnaɪdəd ˈkɪŋdəm – juˈnaɪdəd steɪts ˈbɔrdər/