noun
Principality of Monaco
Official country name; used in formal and news contexts.
モナコ公国は地中海に面した小さな国です。
The Principality of Monaco is a small country facing the Mediterranean Sea.
モナコ is the short, common name for Monaco, while モナコ公国 is the formal, full name.
From the French 'Principauté de Monaco' or English 'Principality of Monaco', with 公国 meaning 'principality'.