Angola, officially the Republic of Angola (Portuguese: República de Angola, pronounced IPA: [ʁɛ'publikɐ dɨ ɐ̃'gɔlɐ] Kongo: Repubilika ya Ngola), is a country in south-central Africa bordering Namibia to the south, Democratic Republic of the Congo to the north, and Zambia to the east, and with a west coast along the Atlantic Ocean. The exclave province Cabinda has a border with the Republic of the Congo and the Democratic Republic of the Congo. Angola was a Portuguese colony from the 16th century to 1975. The country is the second-largest petroleum and diamond producer in sub-Saharan Africa, yet its people are among the continent's poorest. According to the International Monetary Fund, more than $4 billion in oil receipts have disappeared from Angola's treasury in the 2000s. In August 2006, a peace deal was signed with a faction of the FLEC, a separatist guerrilla from the Cabinda exclave in the North, which is still active. About 65% of Angola's oil comes from that region. At 481,321 square miles (1,246,700 km²), Angola is the world's twenty-third largest country (after Niger). It is comparable in size to Mali and is nearly twice the size of the US state of Texas, or five times the area of the United Kingdom. Angola is bordered by Namibia to the south, Zambia to the east, the Democratic Republic of the Congo to the north-east, and the South Atlantic Ocean to the west. The exclave of Cabinda also borders the Republic of the Congo to the north. Angola's capital, Luanda, lies on the Atlantic coast in the north-west of the country. Angola's average temperature on the coast is 60 degrees Fahrenheit (16 °C) in the winter and 70 degrees Fahrenheit (21 °C) in the summer.