The Mediterranean Action Plan of the United Nations Environment Programme (UNEP/MAP)
Official webpage: https://www.unep.org/unepmap/index.php/who-we-are

It seems that UNEP/MAP does a lot of work related to water and drought, sometimes with a unique 'ocean perspective'. On its webpage we can find a lot of useful information.

The Mediterranean Action Plan of the United Nations Environment Programme (UNEP/MAP) is a regional cooperation platform established in 1975 as the first regional action plan under the UNEP Regional Seas Programme.

The Regional Seas Programme launched in 1974 to coordinate activities aimed at the protection of the marine environment through a regional approach. UNEP/MAP became a model for other UNEP-administered Regional Seas Action Plans around the world.

UNEP/MAP was instrumental in the negotiation and adoption of the Convention for the Protection of the Marine Environment and Coastal Region of the Mediterranean (Barcelona Convention) and its Protocols by the Contracting Parties: 21 Mediterranean countries and the European Union.

The Barcelona Convention and its Protocols constitute a unique and advanced multilateral legal framework for the protection of the marine and coastal environment and sustainable use of their resources in the Mediterranean.

The UNEP/MAP–Barcelona Convention system is the comprehensive institutional, legal and implementation framework that the Contracting Parties have adopted for concerted action to fulfill the vision of a healthy Mediterranean Sea and Coast that underpin sustainable development in the region.

Over the last four decades, the UNEP/MAP—Barcelona Convention system has responded to evolving environmental challenges and bolstered a growing body of knowledge on marine and coastal ecosystems and of interactions between development and environment in the Mediterranean region.