There is an interesting story in the Smithsonian about a project to relocate rhinos to the Okavango Delta region to protect them from poachers. There is a map, but it is rather imprecise. The Zambia-Botswana-South Africa tour features a visit to a rhino sanctuary in Zambia. I could not tell from this article whether there is a formal conservation effort for the rhinos in Botswana (or not).
https://www.smithsonianmag.com/science-nature/dangerous-work-relocating-5000-pound-rhinos-180969008/
Sadly, the Smithsonian story reports that the last female white northern rhinoceros died in March 2018. We saw it on our Tauck visit to Kenya one year earlier. Sad to hear of her passing.