noun
Kingdom of Belgium
Official name of Belgium; used in formal contexts, geography, and international relations.
ベルギー王国は西ヨーロッパに位置する立憲君主国です。
The Kingdom of Belgium is a constitutional monarchy located in Western Europe.
ベルギー is the common short name for Belgium, while ベルギー王国 is the formal full name.
From English 'Belgium' + 王国 (kingdom).