the Kalahari Extreme Marathon is a great race and good value, Namibian Desert Challenge is also a fantastic race but they have changed the format slightly so now you don't carry any of your food, so although I loved the event and its well organised isn't quite the challenge it was. Beyond the Ultimate are organising 4 events, one of which will be in Namibia next year, there is the Jordan Ultra in September a stunning location. Racing the Planet put on great events but I personally think they are very expensive.
