Africa's second largest country, the Democratic Republic of Congo is rich in raw materials and minerals but cursed by deadly violence, insurgencies, graft and poverty.The country is preparing for a transition of power after opposition candidate Felix Tshisekedi was on Thursday named by election officials as the provisional winner of an historic presidential poll.Here are key facts about the DRC:Vast countryEighty times the size of its former colonial master Belgium, the DRC covers 2.3 million square kilometres in the middle of Africa, behind only Algeria in area on the continent.The majority of its population of 81.3 million people (World Bank, 2017) is Catholic.As well as having access to the Atlantic Ocean it shares its borders with nine other countries: Angola, Burundi, Central African Republic, the Republic of Congo (also called Congo-Brazzaville), Rwanda, South Sudan, Tanzania, Uganda and Zambia. While the official language is French, it has four indigenous national and 200 vernacular languages, hampering the forging of a national identity since independence in 1960.Regional war The DRC is a nation plagued by conflict and disunity. Its first prime minister, independence hero Patrice Lumumba, was assassinated in 1961.Army strongman Mobutu Sese Seko grabbed power in a coup in 1965, imposed the name Zaire and set up a dictatorial kleptocracy that lasted 32 years.Rebel Laurent-Desire Kabila launched an armed campaign to overthrow Mobutu that drew in neighbouring countries. He seized power in 1997, renaming the country after the mighty Congo river.Kabila expelled the forces of his Rwandan and Ugandan allies, sparking a war in the Kivu border region in which several African countries became embroiled.The 1998-2003 conflict caused millions of deaths from violence, disease and starvation, called by some Africa's "Great War".Many militia groups remain active in Kivu - divided into North and South provinces - which continues to suffer massacres, widespread rape and other atrocities.Central Kasai province is another violence hotspot, with around 3 000 people killed in less than a year of unrest that erupted after soldiers killed a tribal chief in 2016.New political crisis Kabila's son Joseph inherited the presidency after his father was killed by a bodyguard in 2001. He went on to win elections in 2006, the first free polls since independence, and a second term in 2011.Kabila was meant to step down in 2016 but refused, prompting demonstrations met with bloody crackdowns.After various delays, presidential elections went ahead on December 30, 2018 but with more delays announcing the results, fears were raised over the country's stability.Disease and rape Aid agencies have accused all sides in DRC conflicts of using rape as a weapon of war to terrorise local populations.South Kivu-based gynaecologist Denis Mukwege won the 2018 Nobel Peace Prize for his work with women who have been victims of sexual abuse.The country also suffers from Ebola, the hemorrhagic fever named after a river in the north of the country, and cholera.Its 10th outbreak of Ebola since 1976 was declared on August 1, 2018 and has claimed at least 285 lives, according to a health ministry update in early December.A cholera epidemic has claimed 857 lives since the start of the year, the World Health Organisation (WHO) said in November 2018.In 2017 the country had 55 000 cases of cholera, resulting in 1 190 fatalities.Cobalt, copper, coltan The DRC has the potential to be one of Africa's wealthiest countries "if it can overcome its political instability," the World Bank says.It is the world's leading producer of cobalt, a key ingredient in top-range batteries including for smartphones and electric cars, and a top supplier of coltan, another mineral used for electronic products.It is also Africa's top producer of copper and sits on hydrocarbons, tropical timber, gold, diamonds and other minerals.But competition for the wealth has bred conflict, graft, smuggling and mismanagement. It is ranked 176 out of 188 for its human development (UN Human Development Programme) and 161 out of 180 for corruption (Transparency International).In 2017 its economy grew 3.7%, according to the World Bank.