This article focuses on describing the dinamics of Islamization process in sungai besar, a village in the interior area of West Kalimantan, not far from Embau. The writer contends that mass religious conversion by the Iban sub Dayak group in the area is related the close relationship between the Ibans and the Malay. The Iban people who converted to Islam had go to through a process of Srotu bat…