Transboundary water

Regional Institutions & Agreements

SADC – Protocol on Shared Watercourses (Revised, 2000) The primary regional legal framework governing the management and development of shared watercourses in the Southern African Development Community, to which South Africa is a signatory. Establishes principles of equitable and reasonable utilisation, no significant harm, and prior notification for planned measures.

Limpopo Watercourse Commission (LIMCOM) The basin organisation for the Limpopo River, shared between South Africa, Botswana, Zimbabwe, and Mozambique. Coordinates data sharing, monitoring, and joint management across the catchment.

Orange-Senqu River Commission (ORASECOM) The intergovernmental commission responsible for coordinating the management of the Orange-Senqu River basin, shared between South Africa, Lesotho, Botswana, and Namibia – one of South Africa's most strategically important river systems.

Inkomati-Maputo Watercourse Commission (INMACOM) The joint commission managing the Inkomati and Maputo river systems shared between South Africa, Mozambique, and Eswatini – catchments of significant importance for agricultural water use and ecological flows.

Lesotho Highlands Water Project (LHWP) A bilateral treaty project between South Africa and Lesotho involving the transfer of water from the Senqu (Orange) River headwaters in Lesotho to South Africa's Vaal system – one of the largest water infrastructure projects in Africa and central to Gauteng's water supply.

Global Frameworks & Data

UN Watercourses Convention (1997) The primary international legal framework for the management and protection of international watercourses, providing the global context within which South Africa's transboundary obligations sit.

SADC Groundwater Information Portal A regional platform providing information on shared groundwater resources across southern Africa, including transboundary aquifer assessments relevant to South Africa's borders with Botswana, Namibia, and Zimbabwe.

UN-IGRAC – Transboundary Aquifer Assessment The International Groundwater Resources Assessment Centre maintains global and regional databases on transboundary aquifers, including those relevant to southern Africa.

FAO AQUASTAT – Transboundary River Basins Global data on international river basins including area, population, water availability, and use – useful for contextualising South Africa's shared basins within the broader African and global picture.

Transboundary Freshwater Dispute Database (TFDD) Oregon State University's global database of international freshwater treaties, agreements, and disputes – a valuable reference for researchers working on southern African water governance and diplomacy.

GEF International Waters Learning Exchange and Resource Network (IW:LEARN) A global platform for sharing knowledge and resources on transboundary water management, including case studies and project documents from southern African river basins.

South Africa-Specific Context

South Africa's transboundary water obligations are managed primarily through the Department of Water and Sanitation (DWS), with support from the Department of International Relations and Cooperation (DIRCO). Key considerations include:

• The Lesotho Highlands Water Project Phase II – expanding interbasin transfer capacity between Lesotho and South Africa

• Ecological Reserve requirements for shared rivers, which must be negotiated with co-riparian states

• Strategic Water Source Areas that straddle national borders with Lesotho and Eswatini

• Climate change – projected shifts in rainfall and streamflow patterns in shared basins, requiring adaptive joint management frameworks