Ethiopia (/ˌiːθiˈoʊpiə/; Amharic: ኢትዮጵያ?, ʾĪtyōṗṗyā, About this sound listen (help·info)), officially the Federal Democratic Republic of Ethiopia (የኢትዮጵያ ፌዴራላዊ ዲሞክራሲያዊ ሪፐብሊክ, yeʾĪtiyoṗṗya Fēdēralawī Dēmokirasīyawī Rīpebilīk About this sound listen (help·info)), is a country located in the Horn of Africa. It shares borders with Eritrea to the north and northeast, Djibouti and Somalia to the east, Sudan and South Sudan to the west, and Kenya to the south. With over 102 million inhabitants, Ethiopia is the most populous landlocked country in the world and the second-most populous nation on the African continent. It occupies a total area of 1,100,000 square kilometres (420,000 sq mi), and its capital and largest city is Addis Ababa.
Some of the oldest skeletal evidence for anatomically modern humans has been found in Ethiopia. It is widely considered as the region from which modern humans first set out for the Middle East and places beyond. According to linguists, the first Afroasiatic-speaking populations settled in the Horn region during the ensuing Neolithic era. Tracing its roots to the 2nd millennium BC, Ethiopia's governmental system was a monarchy for most of its history. In the first centuries AD, the Kingdom of Aksum maintained a unified civilization in the region, followed by the Ethiopian Empire circa 1137. During the late 19th-century Scramble for Africa, Ethiopia was one of the nations to retain its sovereignty and the only territory in Africa to defeat a European colonial power. Many newly-independent nations on the continent subsequently adopted its flag colours. Ethiopia was also the first independent member from Africa of the 20th-century League of Nations and the United Nations. In 1974, the Ethiopian monarchy under Haile Selassie was overthrown by the Derg, a communist military government backed by the Soviet Union. In 1987, the Derg established the People's Democratic Republic of Ethiopia, but it was overthrown in 1991 by the Ethiopian People's Revolutionary Democratic Front, which has been the ruling political coalition since.
Ethiopia's ancient Ge'ez script (Ethiopic script) is one of the oldest alphabets still in use in the world. The Ethiopian calendar, which is approximately seven years and three months behind the Gregorian calendar, co-exists alongside the Borana calendar. A majority of the population adheres to Christianity (mainly the Ethiopian Orthodox Tewahedo Church and P'ent'ay), whereas around a third follows Islam (primarily Sunni). The country is the site of the Migration to Abyssinia and the oldest Muslim settlement in Africa at Negash. A substantial population of Ethiopian Jews, known as Bete Israel, also resided in Ethiopia until the 1980s.
Ethiopia is a multilingual nation with around 80 ethnolinguistic groups, the four largest of which are the Oromo, Amhara, Somali and Tigrayans.