A new web portal provides unprecedented access to information on over 300 migratory waterbird species, their migration routes and the key wetland sites these birds use in the African-Eurasian region. The Critical Sites Network (CSN) Tool developed during the project supports conservation efforts of countries along the entire Flyway by providing national and local decision-makers, business community and conservation organizations with the improved data access needed for timely and focused wetland and waterbird conservation. It aims to contribute to the establishment of a coherent and climate resilient network of protected or otherwise managed areas by assessing the vulnerability of Critical Sites for waterbirds. The portal has been developed under the framework of the Climate Resilient Site Network in the African-Eurasian Flyway project. This project is supported by the International Climate Initiative on the basis of a decision adopted by the German Bundestag. The original version of the Critical Site Network Tool was developed under the Wings over Wetlands project by BirdLife International, Wetlands International and UNEP-WCMC to support the implementation of the African-Eurasian Migratory Waterbird Agreement (AEWA) and the Ramsar Convention on Wetlands.