Multi-date Landsat satellite data showed that during the last 15 years the coastal changes in the Eastern margin of the Marajó Island is mainly subject to retrograding processes. The retrograding areas compute 0.89 km2 (1986/1995) , 0.381 km2 (1995/1999) e 0.751 km2 (1999/2001); while prograding areas measure 0.214 km2 (1986/1995), 0.321 km2 (1995/1999) e 0.086 km2 (1999/2001). The coastal changes related to accretionary forms are associated to mangrove and beach-barrier development; while erosional features are related to mud terraces, coastal cliffs and mud deposits overlain by beach sands. Use of remote sensing in the study of the mid-term coastal changes constitutes one of the most important tools to record, monitor, map and compare areas in different sites and subject to shoreline retreat and accretion during the last decades.
