For UNOPS and Madagascar's National Office for the Environment, STELLA staff conducted an inventory of Madagascar's marine and coastal ecosystems (in particular, coral reefs and mangroves) and of their biodiversity, and an environmental assessment of Madagascar's coastal zone. Working closely with local experts, STELLA staff collected information and data on the environmental state of marine and coastal resources. STELLA staff identified the main problems and challenges for the sustainable development and conservation of the coastal zone. We recommended institutional, economic, and regulatory tools to implement an Integrated Coastal Zone Management programme in Madagascar. STELLA staff also identified potential marine protected areas.