Abstract: An amphibian vehicle for shallow water, adapted for executing ground operations, such as dredging, removal of growth in channels, ditches and water courses includes a hull (1) with floating capacity, comprising a pontoon onto which several mechanisms for adjusting the height of ground transport mechanisms can be mounted, such as vertically slidable posts (32) or pivotable two armed levers (8). The invention places the mechanisms (8;32) for adjusting the height and the bottom transport mechanisms outwardly from the hull (1) and therefore freely movable with respect to the hull. This gives an improved stability during the operations standing on the bottom (4) and also during sailing, whereby the possible applications are enlarged. As the vehicle is self propelled also the displacement speed can be substantially increased.