Northern Cape Covering 29,7% of the country with an area of more than 360 000 square kilometres, this north-western province suffers from a paucity of rain but has a wealth of minerals. Its capital is Kimberley which is also the diamond capital of South Africa. Alluvial diamonds are found on the opposite, western, side of the province, washed down by the Orange River which runs through the northern section and forms the boundary with Namibia. Other minerals found here are iron, copper, asbestos, manganese, fluorspar, semi-precious stones and marble. Another notable wealth is that of the spring flower explosion in the Nama-Karoo biome, transforming the dry land and sparse scrub of the rest of the year into a festival of colour that attracts visitors from around the world. Tourists are also attracted to another of nature's wonders, the Augrabies Falls, whose 19 separate falls cascade over a granite plateau, dropping a total of 191m; a pool 43m deep has been gouged out by the force of the water. The falls are on the Orange within the Augrabies Falls National Park. The Kalahari Gemsbok National Park is part of the continent's first transfrontier game park, combined with the Gemsbok National Park in Botswana to form the Kgalagadi Transfrontier Park. The Orange River provides a sizeable strip of fertile soil, noted for its vineyards. Wheat and groundnuts are among the crops of the north-western section of the province. Another important economic activity is sheep farming, particularly karakul, centred on the major town of Upington. The marine industry is under development in an area that has suffered from a lack of development in the past with the consequent impoverishment of its people. Climatically, the Northern Province is characterised by very hot summers and very cold winters.