The paper examines how the development of Nusantara’s Capital City poses displacement risks across agrarian and coastal communities in Sepaku, Pamaluan, and Janebora. The research conceptualizes displacement as the accumulation process between “pre-existing land concessions prior to the city construction" and Nusantara’s development pressures. Therefore, the research uses applied theories that describe sequential processes: Socio-Ecological Systems (SES), Coupled Human and Natural Systems (CHANS), and Impoverishment Risks and Reconstruction (IRR). The Socio-Ecological Systems (SES) framework shows the complexity of changes in resource systems, resource units, users, and governance, along with their interactions and outcomes. The Coupled Human and Natural Systems (CHANS) framework later explains how these interactions and outcomes can account for accumulated development impacts before and after infrastructure interventions. The Impoverishment Risks and Reconstruction (IRR) model also incorporates the Socio-Ecological Systems (SES) and the Coupled Human and Natural Systems (CHANS) to capture cumulative socio-ecological effects in displacement risks, including landlessness, livelihood loss, marginalization, food insecurity, loss of access to common-property resources, and social disarticulation. The research methodology adopts a qualitative multiple-case study design to compare agrarian and coastal communities' experiences and responses related to development impacts on socio-ecological change and displacement risks. The analysis uses community-level evidence, expert interviews, policy documents, and secondary spatial data. The recruitment method used purposive sampling, selecting participants based on their capacities, experiences, and knowledge relevant to the research topic. Data collection used semi-structured interviews and focus group discussions to capture participants' experiences of changing access to natural resources, livelihood security, policy exclusion, and adaptation failures. This methodology enables the discovery of interconnectedness and complexity in socio-ecological changes that contributed to displacement risks. There are six findings that were obtained: (i) changing access to land and natural resources, (ii) economic pressures and livelihood diversification, (iii) institutional disconnection, (iv) social conflict, (v) the fear of displacement, and (vi) adaptation failure The reconfiguration among the Socio-Ecological Systems (SES), the Coupled Human and Natural Systems (CHANS), and the Impoverishment Risks and Reconstruction (IRR) develops applied policy recommendations, such as integrated social and environmental assessment, Participatory Asset Valuation (PAV), and Participatory Rural Appraisal (PRA) in order to identify cumulative socio-ecological impacts and ecological changes and recognize community livelihood, mitigating displacement risks.