This research aims to analyze the challenges of cross-border da'wah communication and the sociocultural adaptation strategies employed by preachers (dai) in the Frontline, Outermost, and Disadvantaged (3T) regions of Indonesia. Da'wah in 3T regions requires more than conventional lecturing due to severe geographical isolation, thick local mystical beliefs, cultural resistance, and minimal infrastructure. This qualitative study used a case study approach, collecting data through in-depth interviews, non-participant observations, and documentation from ten purposively selected operational field preachers. The collected data were analyzed using Miles and Huberman’s interactive model. The results indicate that preachers experience language barriers, low religious literacy, and severe structural limitations. To overcome these barriers, preachers adapt by shifting from oral preaching (da'wah bil-lisan) to action-oriented, community-based development preaching (da'wah bil-hal), utilizing interpersonal approach models, local language assimilation, and economic empowerment. This study implies that contextual da'wah adaptation significantly enhances religious acceptance and fosters socioeconomic resilience among marginal Muslim groups in border areas.
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