The coastal region of the state Amapá located at the mouth of Amazonas River, is the main way to outlet industrialized products and petroleum derived, being a dynamic environment with a large energy provided by the high tidal variation and discharge of Amazonas River, main controllers of the balance sedimentological at area. The work presented aims in broadening knowledge bathymetric dynamics and development bed morphology. In the first decade of this century the North Channel area at Amazonas River, by multitemporal analysis bathymetric, data collected at field in 2007, and nautical letters of Diretoria de Hidrografia e Navegação (DHN) – in years 2001 and 2010, making maps of distribution depths and block diagrams of morphology bed in order to multitemporal rating. One of the most evident results was a tendency that sandbanks, in 2001, are suffering migration/erosion moving by north of the study area, with a increasing depth to south by the years 2007 and 2010.
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