According to Leifeld and Menichetti (2018), it is estimated that around 41% (24.1 Mha) of the global tropical peatlands have been drained and converted into non-forested peatland areas (Figure 1.1), contributing ~1.48 (0.04-2.79) Gton CO 2eq emissions. Meanwhile, the largest proportion of tropical peatland is in SouthEast -Asia with around 57% (24 Mha) of the global tropical peatland, and almost half of this area (47%) is located in Indonesia which holds 57.4 Gton C or ~65% of the global tropical peatland carbon resource (Page et al. 2011). Figure 1.1 The proportion of global tropical peatland in the global peatlands and their distribution based on land uses (adapted from Leifeld and Menichetti 2018). 1.1.2 The state of the Indonesian tropical peatlands 1.1.2.1 The national distribution Indonesian peatlands probably cover about 4% of the global peatlands and are the fourth-largest peatland area in the world after the peatlands in Russian, Canada, and the United States (Xu et al. 2018). In Indonesia, peatlands cover between 6-14% of the total Indonesia's land area, ranging from 12 to 26.4 million hectares (depending upon the sources of the peatland distribution map, Wahyunto and Suryadiputra 2008; Ritung et al. 2011; MoEFRI 2015). Based on the current official government map of peatlands in Indonesia, Indonesian peatlands are predominantly distributed in the islands of Sumatra (~43%), Kalimantan (~32%) and Papua (~24%), comprising seventeen provinces of in total thirty-three provinces in Indonesia (Ritung et al. 2011). Most of the Indonesian peatlands are located on the low-altitude coastal Indonesia showed robust economic performance during the global financial crisis 2008-2009 as reflected from its Gross Domestic Product (GDP) growth rate recovery from 4.6% in 2009 to a relatively stable 6% in 2010-2012 and 5% until 2018 which was made possible by a rise in commodity exports, solid public finances and the strong domestic demands. Based on the Master Plan for Acceleration and Expansion of Indonesia's Economic Development 2011-2025, with the Government's goal of 7% average annual growth of GDP, Indonesia has potential to jump from the 16th largest economy in the world in 2012 to the 10th by 2025. From the year 1965 to 2017, Indonesia's economy has changed from being highly relying on agriculture sector to become a more balanced economy where the contribution of national GDP due to the industrial, manufacturing, and services (value-added) sectors were becoming more dominant and pronounced over the agricultural sector. yet. This is evidenced in four knowledge gaps that will be addressed in this study. First, large areas of Indonesian natural peatland ecosystems have been converted, but information on the current status of peatlands and trends under different uses as well as the dynamics of ecosystem services supplied and the major differences in peat development at the scale of the country is scarce. Although the potential effects of changes in Indonesian peatlands are now increasingly well understood (e.g. Hooijer ...