The TFCA is made up of South Africa's Kalahari Gemsbok National Park and Botswana's Gemsbok National Park. This is the only Transfrontier Park to date that is open in the true sense of the word – here tourists can move freely across the international border within the boundaries of the park. In recognition of a verbal agreement reached in 1948 leading to the de facto existence of the park, no barrier exists along the international border separating the constituting parks. The sheer vastness of the Kgalagadi Transfrontier Park requires little extensive management intervention, allowing the nomadic ungulate populations and their predators to maintain balance within the natural system.