South Africa has nine provinces, each with its own legislature, premier and executive council. The provinces most popular with travellers are the Western Cape, KwaZulu-Natal and Gauteng. Together they account for approximately 75% of tourist activity. The other provinces are the Eastern Cape, the Free State, Limpopo, Mpumalanga, The Northern Cape and the North West province. The vast, semi-arid Northern Cape is the largest of the provinces and takes up 30% of the country. It has a population density of only three people per square kilometre. Gauteng is the smallest province, but is the economic heartland of the country – it is responsible for one third of South Africa's GDP.