About the S2S Platform

The Action Platform for Source-to-Sea Management is a network of organizations committed to promoting, building commitment for, and implementing source-to-sea action to address key development challenges.


The S2S Platform leverages the voice of its partners to keep source-to-sea action on the agenda. Partners grounded in research, implementation and monitoring strengthen the evidence-base and build the demand for source-to-sea action. They demonstrate that a source-to-sea approach is needed to address persistent and rising issues such as climate change, water and marine pollution, and biodiversity decline.

The Platform builds capacity in source-to-sea management and works to provide local practitioners with the required resources to plan and act holistically. The global network of partners connects to share learnings and expertise, with each other and beyond, to grow the source-to-sea community.

The activities of the S2S Platform are supported by a secretariat, hosted by the Stockholm International Water Institute (SIWI). The secretariat helps to maintain a vibrant community of committed source-to-sea advocates through facilitating partner engagement activities and supporting collaborative activities.

Source to sea

This is S2S Platform

The Action Platform for Source-to-Sea Management is a network of organizations committed to promoting, implementing, and building expertise on source-to-sea management.

Why S2S management

The Action Platform for Source-to-Sea Management, often referred to as S2S Platform, was formed in 2014, at the initiative of a group of committed partners.

Over the years it has successfully influenced policy dialogues as well as operational and financing strategies to better reflect the need for source-to-sea action. It has raised awareness and political attention to source-to-sea issues. And in the process, it has brought the freshwater and ocean communities together, and supported policy makers and practitioners through the development and dissemination of knowledge materials, policy briefs and practical tools.

At the end of the 2017–2020 strategy period, the S2S Platform could demonstrate notable achievements, but there is still a long way to go. With the Strategy 2021–2025, the aim is to achieve the vision: “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”.  The S2S Platform does this by focusing on key strategic aims and clear ambitions for what it wants to achieve by 2025.

The strategic aims are:

  • Strengthening partnership across actors and initiatives: Through individual and joint activities, we will engage our extensive networks and connect with relevant initiatives promoting source-to-sea policies and practice; thereby building understanding, commitment, and action to address source-to-sea issues.
  • Growing understanding: We will substantiate the need for and benefits of the source-to-sea approach and increase the understanding of source-to-sea linkages by gathering and sharing knowledge, building an evidence-base gained through research, and developing guidance on addressing source-to-sea challenges.
  • Building commitment for source-to-sea action: We will inform and influence global, regional, and transboundary agenda setting and the priorities of governments, financiers, private sector, and civil society to effectively address source-to-sea issues in policy and practice.
  • Taking action on the ground: We stimulate source-to-sea action by raising awareness from grassroots to national levels, building local and regional capacity and demonstrating its benefits in addressing development challenges through practical application.

Goals for 2025

  • The S2S Platform will have active, engaged partners representing the diversity of actors needed to fulfill our vision.
  • The S2S Platform establishes a global source-to-sea knowledge hub.
  • Source-to-sea perspectives hold a permanent place in the global agenda as a solution to rising and persistent development challenges.
  • Expertise is built and source-to-sea management is applied in six continents.

The Steering Committee, elected from among the partners, guides the direction of the S2S Platform.

It identifies annual priorities and take a leading role in promoting the source-to-sea approach by engaging its collective networks.

Members of the Steering Committee:

  • Torkil Jønch Clausen, Chair
  • Delta Alliance (DA), Sharon Tatman​, Expert Advisor
  • Food and Agriculture Organization of the United Nations (FAO), Sasha Koo-Oshima, Deputy Director, Land & Water Division
  • French Water Partnership (FWP), Andrea Ferret, Programme Officer, freshwater biodiversity and nature-based solutions
  • Global Water Partnership (GWP), Yumiko Yasuda, Senior Network & Transboundary Water Cooperation Specialist
  • International Union for Conservation of Nature (IUCN), James Dalton, Director, IUCN Global Water Programme
  • International Water Resources Association (IWRA), Callum Clench​, Executive Director
  • Stockholm International Water Institute (SIWI), Karin Gardes, Chief Operating Officer  ​
  • United Nations Development Programme (UNDP), Andrew Hudson​, Head, Water & Oceans Governance Programme
  • United Nations Environment Programme (UNEP), Tessa Goverse, Chief, Pollution-Free Ecosystems Unit and GPA Coordinator
  • United Nations Educational Scientific and Cultural Organization (UNESCO), Abou Amani, Director a.i. of Division of Water Sciences


  • Secretariat of the Global Environment Facility (GEF), Astrid Hillers, Senior Environmental Specialist, International Waters

  • Swedish Agency of Marine and Water Management, Jakob Granit, Director General

“One role of partnerships, like the one provided through the S2S Platform, is to bridge the gap between the various SDG interest groups to collectively achieve the 2030 Agenda. By applying the source-to-sea ethos to the challenges we face today, we will build towards healthy land-freshwater-marine ecosystems coherence, and through that a more climate resilient and sustainable future”

Peter Thomson, UNSG Envoy for the Oceans

S2S Platform Strategy

The strategy focuses the activities of the Platform partners on four strategic areas needed to achieve the Platform’s mission and make progress toward its shared vision.

Download the strategy
Our partners
Alliance for Global Water Adaptation (AGWA) logo
Alliance for Global Water Adaptation (AGWA)
Alliance for Water Stewardship logo
Alliance for Water Stewardship
Logo of Amazon Cooperation Treaty Organization
Amazon Cooperation Treaty Organization (ACTO)
Asia-Pacific Water Forum logo
Asia-Pacific Water Forum (APWF)
Benguela Current Convention logo
Benguela Current Convention
Inernational Capacity Development Network for Sustainable Water Management (Cap-Net) logo
International Capacity Development Network for Sustainable Water Management (Cap-Net)
Clean Water Wave
Moroccan Coalition for Water (COALMA) logo
Moroccan Coalition for Water (COALMA)
Commission on the Protection of the Black Sea Against Pollution logo
Commission on the Protection of Black Sea against Pollution
Conservation International logo
Conservation International
Delta Alliance logo
Delta Alliance
Food and Agriculture Organization of the United Nations (FAO) logo
Food and Agricultural Organization of the United Nations
Global Environment Facility (GEF) logo
Global Environment Facility
UN environment programme logo - Governing the Global Programme of Action
Global Programme of Action for the Protection of the Marine Environment from Land-based Activity (GPA)
Global Water Partnership logo
Global Water Partnership
International Association for Hydro-Environment Engineering and Research (IAHR) logo
International Association for Hydro-Environment Engineering and Research (IAHR)
International Commission for the Protection of the Danube River
International Commission for the Protection of the Danube River (ICPDR)
Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA) logo
Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA)
International Water Resources Association (IWRA) logo
International Water Resources Association (IWRA)
Internaional Union for Conservation of Nature (IUCN) logoIUCN
International Union for Conservation of Nature (IUCN)
Ocean Sewage Alliance logo
Ocean Sewage Alliance
Orange-Senqu River Commission (ORASCE)
Orange-Senqu River Commission (ORASCE)
Observatoire des Sciences de l’Univers de Nantes Atlantique (OSUNA)
Partnerships in Environmental Management for the Seas of East Asia (PEMSEA) logo
Partnerships in Environmental Management for the Seas of East Asia (PEMSEA)
Race for the Baltic logo
Race for the Baltic
Ramsar Convention logo
Ramsar Convention
Stockholm Environment Institute logo
Stockholm Environment Institute
The Nature Conservancy logo
The Nature Conservancy
UNEP-DHIP partnership logo
UNEP-DHI Partnership – Centre on Water and Environment
United Nations Development Programme (UNDP)
United Nations Development Programme (UNDP)
UNESCO Intergovernmental Hydrological Programme logo
Water-culture Institute logo
Water Culture Institute
logo of water Science policy
Water Science Policy
Wetlands International logo
Wetlands International
University of New South Wales logo
UNSW Sydney Global Water Institute
Logo of Xiamen University
Xiamen University
Funded by
Flag of Sweden
Government of Sweden
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United Nations Development Programme