The texts of the post-Rio conventions leave no doubt concerning the importance of environmental information to support the fight against both desertification and loss of biodiversity as well as adaptation to climate change by developing systems for the collection of data and the production of coordinated, integrated information. In this context, the dissemination of shared and mutually beneficial information for the implementation of international commitments is crucial for the rationalization of resources and the consistency of actions designed to address environmental challenges. More than anywhere else, the economies of counties in circum-Saharan Africa are extremely dependent on the use of natural resources and hence on their good management. Sustainability can only be efficiently managed via reliable diagnoses of the condition of natural resources, population dynamics, and the practices used by local populations. To this end, there is a great need to both increase observations and develop integrated environmental information systems. Ideally, data collection and processing should be able to: (i) provide useful information to enable monitoring of the implementation of national policies, especially action plans, (ii) support policy decisions to fight desertification, support adaptation to climate change and the conservation of biodiversity. OSS’s objective to develop decision-support tools led to the decision to exploit the experience acquired by ROSELT / OSS by supporting the establishment of national environmental monitoring systems (DNSE) in circum-Saharan countries. Recent studies by OSS on the implementation of these systems reveal the efforts made by these counties to ensure the synergy of the conventions. However, many challenges have to be faced, particularly to ensure the quality and usefulness of the information produced. In this paper, we first present the data and information required by the three major multilateral environmental agreements, the aim being to identify possible synergies. In the second part, we describe the experiments conducted as part of national environmental monitoring with the aim of analyzing the achievements and difficulties encountered during the implementation of integrated environmental monitoring systems, a central element of these devices, which will help ensure the synergy of the conventions. Finally, we focus on the technical and institutional requirements of the implementation of integrated environmental monitoring systems.