South Sudan is a young country that achieved independence from Sudan in 2011 after years of civil war. The population of South Sudan is around 11 million, of which more than three-quarters are under the age of 25. The country has a well-developed infrastructure, but vast areas are still without access to electricity or clean water. The economy is based mostly on agriculture, with oil and gas reserves also being important. In addition, gold and other mineral resources are being explored. South Sudan is home to a variety of cultures and languages, including Arabic, Dinka, Nuer, Shilluk, and English. Islam is the main religion. Along with members of the national army and police force, civilians make up the majority of the country's armed forces. The UN has set up several protection zones in South Sudan to help protect civilians from attacks by ethnic militias.