Border management has, on the one hand, grown beyond the conceptual limit that is the terminological definition of borders as lines separating countries to also factor in their development as areas. On the other, it should aim to strengthen state sovereignty and improve the welfare of its citizens. These often lead to the dichotomy between security and prosperity in border management approaches. Regionalism is an approach used to create regional integration across national borders, but this concept is strongly influenced by the interests of states on each side of the border. Therefore, this research explores if spatial interaction between border communities is controlled by the regionalism concept introduced by the state or, instead, grows organically as part of regionalization due to livelihoods that require border crossings. It used a case study of Sebatik Island in the Indonesia-Malaysia border area. The qualitative research design applied exploratory principles on the spatial interaction pattern formed between border communities and then synthesized the identified units of information on transboundary activities while considering government-issued policies on border management. Results showed that regionalism was only minimally implemented in managing the border area. It means that border landscapes in Indonesia are organically formed on the micro-scale even though the perspective of regionalism has long been adopted at the regional level, i.e., ASEAN. ©2023 by the authors.