Khoisan Corral

This is a photo of a Khoisan corral in an isolated valley in South Africa—surely hundreds of years old: pre-history. Locals say that the corral has visibly deteriorated during the past generation—however, parts of it are still in perfect condition. I would estimate that it encloses about a hectare. OBSERVATION: The locals prefer to keep the evidences of Khoisan culture secret—I doubt that I would be shown some of what I am told about.