Algeria, officially known as the People's Democratic Republic of Algeria, is a country located in North Africa, bordering the Mediterranean Sea to the north, Tunisia to the northeast, Libya to the east, Niger to the southeast, Mali to the southwest, and Mauritania to the west. It is the largest country in Africa and the Arab world. The country has a diverse landscape, ranging from the fertile coastal plain in the north, known as the Tell, to the Sahara desert in the south. The capital and largest city is Algiers, located in the north. The official languages are Arabic and Berber, with French also widely spoken. The country has a diverse culture, influenced by its Berber, Arab, and French colonial history. The economy is primarily based on oil and natural gas production, with agriculture and manufacturing also playing a significant role.