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Conflicts between human and environment always triggered to sedimentation and erosion problems within the coastal areas, Therefore understanding sediment transport processes in a river estuary and coastal waters was important when studying sediment transport and mobility within the river coastal environment. This article aims to investigate the sediment transport and mobility of the Kemaman River estuary, Terengganu Malaysia. In this article, it was demonstrated that anthropogenic activities within a watershed, such as agriculture and urbanization affected the sediment yield from the watershed. Over four months observation (November 2008-February 2009), the delivery of suspended sediment from the Kemaman River to the Kemaman Estuary had increased by about 25%. Based on the in-situ measurement of ¹³⁷Cs activity, the measure activity ranged between 5638-22421 cpm for backshore while for …