Turkmen is the official language of Turkmenistan, though Russian is still widely spoken in cities. Turkmenistan has a single-party system led by a president who is both head of state and head of government. Islam is the dominant religion among Turkmen people, while Orthodox Christianity is common among ethnic Russians. The country lies within Central Asia and over 80% of its land is covered by the Karakum Desert. Turkmenistan has significant natural gas and oil reserves and is a net exporter of electricity.