Beyond BoundariesThe African ChallengeEpisode 4BBC Two Duration: 1 hourFirst broadcast: Sun 22nd Oct 2006, 21:00 on BBC Two EnglandLatest broadcast: Wed 1st Nov 2006, 02:00 on BBC One ScotlandIn the final leg, the team face the toughest part of their journey - crossing the burning and mountainous sand dunes of the world's oldest desert.GenresFactualTravelFactualDisabilityBrandBeyond BoundariesSeriesBeyond Boundaries: The African Challenge Source: BBC Online