A numerical, non-linear, barotropic, two-dimensional tidal model was implemented and used to simulate the M 2, S 2, N 2, K 1, O 1 and M 4 constituents in Golfo Nuevo (Argentina) and the adjacent continental shelf. The model includes the calculation of the vertical distribution of flow velocities using the linear three-dimensional equations. The tidal circulation was modeled by forcing at the open ... [Show full abstract] boundaries. Field measurements have shown that the hydrodynamics of Golfo Nuevo is basically of a semidiurnal character. Because of the difference in magnitude between M 2 and the other constituents the M 2 tide induces the strongest currents. These are strong on the shelf, with speeds exceeding 50 cm/s at maximum flood and ebb, but close to the coast become parallel to it and somewhat weaker, except at Golfo Nuevo mouth and near Punta Delgada. The direction of maximum current is almost constant in the vertical at the adjacent continental shelf, whereas in the middle of Golfo Nuevo the axes of the ellipse at the bottom appear rotated 24° counterclockwise with respect to those at the surface. Calculated tidal currents within Golfo Nuevo are reduced by a factor of about 5 with respect to those on the adjacent shelf. The resulting sea levels and currents compare well with the limited observation available. Cotidal and corange lines and the axes of the tidal current ellipses are also presented.