4. FACTS Libya is the fourth largest country in Africa by area, and the 17th largest in the world The capital, Tripoli, is home to 1.7 million of Libya's 5.7 million people Libya has the highest HDI in Africa and the fourth highest GDP (PPP) per capita in Africa as of 2009 The flag of Libya consists of a green field with no other characteristics. It is the only national flag in the world with just one color and no design, insignia, or other details!