As an archipelago country, Indonesia harbors vast area of coastal wetlands such as mangrove and peatland that stores around 50 Gt carbon (C). Indonesian coastal wetlands are also rich in biodiversity, providing habitats for over 2000 species of flora and fauna. However, coastal wetlands in Indonesia potentially sustain significant loss due to inundation following the upcoming rapid sea level rise in addition to landuse change and conversion following rapid population growth in the coastal areas.To reduce the impact of sea level rise and to ensure the sustainability of these ecosystems and their important functions, conservation, management and restoration of Indonesian coastal wetlands are necessary to be conducted. As conservation, management and restoration can be costly while sufficient resources are not always available, effective and efficient strategies are required. For this, a thorough ecological understanding is critical. However, current knowledge relating to coastal wetlands in Indonesia remains a large gap. Moreover, thorough ecological understanding is often difficult to gather as some ecosystem processes and their responses to environmental changes often occur after a long period of time. Therefore, long term ecological studies, such as palaeoecology, are required to conduct.Thereupon, this multi-proxy palaeoecological research that includes was carried out on two Indonesian coastal wetlands, Sungai Buluh peatland in Central Sumatra and Segara Anakan lagoon in Central Java, in order to: (1) improve the insights on the environmental process and dynamics of coastal wetlands in Indonesia as well as the mechanisms and dynamics of their capacity to store C; (2) underline their potential for x climate change mitigation; and (3) provide consideration to improve conservation, management and restoration of coastal wetlands in Indonesia. This research suggests that Indonesian coastal wetlands and their capacities to sequester C are very dynamic and mainly influenced by sea level changes, climatic variabilities and human activities. These factors mainly alter the hydrological conditions and vegetation composition of the coastal wetlands, although the impacts can be sitespecific. Coastal wetlands in Indonesia also have high potential for global climate change mitigation for they have considerable capacities to accumulate C compared to similar ecosystems globally. Additionally, Indonesian coastal wetlands have shown resilience to past disturbances, both natural and anthropogenic. Based on the outcomes, some considerations to improve coastal wetlands conservation, management and restoration are provided. This includes (1) setting up priorities or classifying the importance of species, ecosystems, areas, or actions, in order to help solving the most critical problems, optimizing the efforts and allocating the resource; (2) incorporating socioeconomic needs in conservation and sustainable use; (3) selecting effective and efficient restoration approach; and (4) evaluating policy design and implementation. xi Zusamen...