Which boundary line separates the European countries of Spain and Portugal?

The Blue Line is associated with the border between which two countries?

Which boundary line separates the Asian countries of Iran and Iraq?

The Macau-Zhuhai-Hong Kong Bridge connects which two territories?

The Maginot Line was a defensive fortification built by which two countries?

The Hindenburg Line was a defensive fortification built during which conflict?

The Mackenzie River serves as a natural boundary line in which country?

The Strait of Gibraltar separates which two continents?

The Berlin Wall was a significant boundary line separating which two regions

The Line of Actual Control (LAC) is a disputed boundary line between which two countries?