Libya (Arabic: ليبيا Lībiyā pronunciation (help·info); Libyan vernacular: Lībya pronunciation (help·info); Amazigh: ), officially the Great Socialist People's Libyan Arab Jamahiriya, GSPLAJ ( الجماهيرية العربية الليبية الشعبية الإشتراكية العظمى Al-Jamāhīriyyah al-ʿArabiyyah al-Lībiyyah aš-Šaʿbiyyah al-Ištirākiyyah al-ʿUẓmā pronunciation (help·info)), is a country located in North Africa. Bordering the Mediterranean Sea to the north, Libya lies between Egypt to the east, Sudan to the southeast, Chad and Niger to the south, and Algeria and Tunisia to the west. With an area of almost 1.8 million square kilometres (700,000 sq mi), 90% of which is desert, 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. The three traditional parts of the country are Tripolitania, the Fezzan and Cyrenaica. The name "Libya" is an indigenous (i.e. Berber) one, which is attested in ancient Egyptian texts as , R'bw (= Libu), which refers to one of the tribes of Berber peoples living west of the Nile. In Greek the tribesmen were called Libyes and their country became "Libya", although in ancient Greece the term had a broader meaning, encompassing all of North Africa west of Egypt. Later on, at the time of Ibn Khaldun, the same big tribe was known as Lawata. The Flag of Libya is the only national flag in the world with just one color - green - with no design, insignia, or other details. Libya extends over 1,759,540 square kilometres (679,182 sq. mi), making it the 17th largest nation in the world by size. Libya is somewhat smaller than Indonesia, and roughly the size of the US state of Alaska. It is bound to the north by the Mediterranean Sea, the west by Tunisia and Algeria, the southwest by Niger, the south by Chad and Sudan and to the east by Egypt. At 1770 kilometres (1100 miles), Libya's coastline is the longest of any African country bordering the Mediterranean. The portion of the Mediterranean Sea north of Libya is often called the Libyan Sea. The climate is mostly dry and desertlike in nature. However, the northern regions enjoy a milder Mediterranean climate. Natural hazards come in the form of hot, dry, dust-laden sirocco (known in Libya as the gibli). This is a southern wind blowing from one to four days in spring and autumn.