JOHAN MARTIN VAN ZYL
Yes, unless things have changed in the area very much, the old farm house was just off the main road between Piet Retief and Pongola on the western side of the dam.  It is a very well-known and big dam.  It was only known to me as - referred to as the Pongola dam and I cannot remember exactly how far from the national road, but those are the co-ordinates, more or less.