Discuss one catchment area in South Africa?

Covering many South African river basins, the 'Working for Wetlands' programme operates in all major catchments.

So far the programme has been active in about 15 river basins, including the upper reaches of tributaries of the Limpopo, Tugela, Vaal, Nkomati, Oliphants, and Usutu Rivers. They have also been working on smaller river systems such as Berg, Umzimvubu, Black Umfolozi, Krom, Kouga, Blood, Breede, and Sand Rivers. Though this isn't the full answer, this might give you some insight on where the some of the projects are being ran.