The Lebombo bone, discovered in the Border Cave in the Lebombo Mountains between South Africa and Eswatini (formerly Swaziland), is considered the oldest known mathematical artifact in the world. This baboon fibula contains 29 distinct notches that were deliberately carved into the bone. Archaeologists believe it may have functioned as a lunar phase counter or calendar, used to track monthly cycles. The artifact demonstrates that mathematical thinking and the development of counting systems existed in Africa tens of thousands of years before the emergence of written mathematics in Mesopotamia and Egypt.