Nigeria, an African country on the Gulf of Guinea, has many natural landmarks and wildlife reserves. Nigeria is a middle-income, mixed economy and emerging market, with expanding manufacturing, financial, service, communications, technology and entertainment sectors. It is ranked as the 21st-largest economy in the world in terms of nominal GDP, and the 20th-largest in terms of purchasing power parity. It is the largest economy in Africa; its re-emergent manufacturing sector became the largest on the continent in 2013, and it produces a large proportion of goods and services for the West African subcontinent. In addition, the debt-to-GDP ratio is 11 percent, which is 8 percent below the 2012 ratio.