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PlatformAction Platform for Source-to-Sea Management (S2S Platform)
The source-to-sea approach recognizes that what we do on land and in rivers, lakes and aquifers can have impacts further downstream, along coasts and in the ocean. By taking these linkages into account, the approach applies a holistic view of the source-to-sea system, which will result in greater benefits for the entire system.
The S2S Platform is open to organizations committed to holistic management of land, freshwater, coasts and the ocean. The Platform Secretariat is hosted and coordinated by Stockholm International Water Institute (SIWI).
Our vision
We envision a world in which land, freshwater, coastal and marine resources are managed holistically, balancing benefits for the environment, communities and economy from source to sea.
Our mission
We want to enable sustainable development across the land-freshwater-marine continuum through supporting the adoption and implementation of a source-to-sea approach to management at regional, national, and sub-national levels.
Important changes to the S2S Platform
Since 1 January 2025, The Action Platform for Source-to-Sea Management (S2S Platform) is being hosted by IUCN. These pages are not longer updated. They are a legacy from when SIWI hosted the S2S Platform between 2014 and 2024.
For the most updated information about the S2S Platform:
The Action Platform for Source-to-Sea Management (S2S Platform) is a multi-stakeholder initiative to exchange and generate knowledge, and support joint action for improved management of land, water, coastal and marine linkages. The S2S Platform strengthens partnerships between sectors and expands the understanding of source-to-sea challenges and of the solutions that will lead to sustainable development. It builds commitment so that policies and finance stimulate source-to-sea action on the ground.
Our Mission
We envision a world in which land, freshwater, coastal and marine resources are managed holistically, balancing benefits for the environment, communities and economy from source to sea.
Our Vision
We want to enable sustainable development across the land-freshwater-marine continuum through supporting the adoption and implementation of a source-to-sea approach to management at regional, national, and sub-national levels.
The S2S platform is funded by:

