Single-beam bathymetric surveys are used in several areas, namely, in the assessment of underwater geography as determining factor for navigation; conducting scientific studies and exploration of oil and natural resources. The data acquired in this type of surveys offers a grid of X, Y and Z sample points. For the correct spatial visualization in a continuous data grid, it is necessary to apply mathematical interpolators to estimate the depth value in the points not covered by the survey. The Sargassum furcatum bed presents on Cabo Frio island is the target of several studies due the importance of its primary productivity and biodiversity. It was verified after the elaboration of the digital depth models, characteristics regarding the location and spatial distribution of the Sargassum furcatum bed. Based on results obtained in the construction of the digital depth models, it was possible to demonstrate that the association of surveys, mining and interpolation methods for single-beam bathymetry data, developed during this study, were suitable to assess the visualization the Sargassum furcatum bed in Cabo Frio Island, Arraial do Cabo - RJ.