This study discussed the determination of Indonesia-Malaysia land border and its implications for regional resilience (A Study of Roles of the Directorate of Topography of the Indonesian Army in the Determination of Indonesia-Malaysia Land Border in Sei Menggaris Nunukan North Kalimantan). This research applied the qualitative research method. Data collection methods were observations, in-depth interviews, documents and literatures review, and online data tracking. The findings indicated that roles of the Directorate of Topography of the Indonesian Army in the determination of Indonesia-Malaysia land border included border demarcation and Investigation, Refixation, and Maintenance (IRM) of Indonesia-Malaysia border. The determination of Indonesia-Malaysia land border strengthened the regional resilience of Sei Menggaris Nunukan North Kalimantan. Kata Kunci : Land Border, Roles, Regional Resilience
                        
                        
                        
                        
                            
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