Botswana is a landlocked country located in Southern Africa. The country is bordered by South Africa to the south and east, Namibia to the west and north, and Zimbabwe to the northeast. Its border with Zambia to the north near Kazungula is poorly defined but is, at most, a few hundred metres long. Botswana is one of the most sparsely populated countries in the world. Around 10 percent of the population lives in the capital and largest city, Gaborone. The economy is dominated by mining, cattle, and tourism. Botswana boasts a GDP (purchasing power parity) per capita of about $13,825, making it one of the world's wealthier nations. The country has been among the hardest hit by the HIV/AIDS epidemic. The disease has had a devastating effect on the country's social and economic fabric. Botswana has the world's third highest prevalence rate of HIV/AIDS, with an estimated 230,000 people living with the disease in 2013.