Burundi (pronounced [buˈɾundi]), officially the Republic of Burundi, is a small country in the Great Lakes region of Eastern Africa bordered by Rwanda on the north, Tanzania on the south and east, and the Democratic Republic of the Congo on the west. Although the country is landlocked, much of the southwestern border is adjacent to Lake Tanganyika. The Twa, Tutsi, and Hutu tribes have occupied Burundi since the country's formation five centuries ago. Burundi was ruled as a kingdom by the Tutsi for over two hundred years. However, at the beginning of the twentieth century, Germany and Belgium occupied the region, which caused Burundi and Rwanda to be a European commonwealth known as Ruanda-Urundi. Political unrest occurred throughout the region because of social differences between the Tutsi and Hutu. As a result, civil war emerged in Burundi throughout the middle twentieth century. Presently, Burundi is governed as a presidential representative democratic republic. Sixty-two percent of Burundians are Roman Catholic, eight to ten percent are Muslims and the rest follow indigenous beliefs and other Christian denominations. Burundi is one of the ten poorest countries in the world. Due to civil wars, Burundi has a low gross domestic product, unstable population growth, and sparse resources. Cobalt and copper are among Burundi's natural resources. Some of Burundi's main exports include coffee and sugar. The smallest country in Africa. Burundi is landlocked and has an equatorial climate. Burundi is a part of the Albertine Rift, the western extension of the Great Rift Valley. The country lies on a rolling plateau in the center of Africa. The average elevation of the central plateau is 5,600 feet (1,700 m), with lower elevations at the borders. The highest peak, Mount Karonje at 8,810 feet (2,690 m), lies to the southeast of the capital, Bujumbura. The Nile is a major river in Burundi. Lake Victoria is also an important water source, which serves as a fork to the Kagera River.[39][40] Another major lake is Lake Tanganyika, located in much of Burundi's southwestern corner. Burundi's lands are mostly agricultural or pasture. Settlement by rural populations has led to deforestation, soil erosion and habitat loss. Deforestation of the entire country is almost completely due to overpopulation, with a mere 230 square miles (600 km2) remaining and an ongoing loss of about 9% per annum.