The southern white rhinoceros (Ceratotherium simum simum) is a subspecies of white rhinoceros native to southern Africa. Here’s a description of its distribution by country:

1. South Africa: Southern white rhinos are primarily found in South Africa, where the majority of the population resides. They are distributed across various regions of the country, including national parks, private game reserves, and protected areas. Some of the key areas where southern white rhinos are found in South Africa include Kruger National Park, Hluhluwe-iMfolozi Park, and Addo Elephant National Park.
2. Namibia: Southern white rhinos are also present in Namibia, particularly in the northern and central regions of the country. They are found in various habitats, including savannas, grasslands, and semi-arid areas. Etosha National Park is one of the key areas where southern white rhinos can be found in Namibia.
3. Zimbabwe: Southern white rhinos inhabit certain parts of Zimbabwe, particularly in national parks and private game reserves. Hwange National Park is one of the key areas where southern white rhinos are found in Zimbabwe.
4. Botswana: Southern white rhinos are also found in Botswana, primarily in the northern and central regions of the country. They inhabit various habitats, including savannas, woodlands, and semi-arid areas. Okavango Delta and Moremi Game Reserve are some of the areas where southern white rhinos can be found in Botswana.

Southern white rhinos are the most abundant rhinoceros subspecies, primarily due to successful conservation efforts and breeding programs. However, they still face threats from poaching for their horns, habitat loss, and human-wildlife conflict. Conservation organizations and governments in southern Africa are actively involved in rhino conservation efforts to protect these iconic animals and ensure their survival for future generations.