We use 1.5 years of continuous recordings of an amphibious seismic network in NE South America and SE Caribbean to determine the crustal and uppermost mantle structure beneath the region through ambient noise tomography. The combination of broadband OBSs (ocean bottom seismometers) and land stations of this experiment make it an ideal opportunity for testing processing methods to obtain the empirical Green¿s functions (EGFs). Our results show EGFs with good signal-to-noise ratio for land-land, land-OBS and OBS-OBS paths, with the implementation of cross-correlation methods (linear and phase cross-correlation) and stacking methods (linear, phase-weighted stacking, and a combination of both). From these EGFs, we obtain phase and group velocities of Rayleigh and Love waves in the fundamental mode, using automatic and manual time-frequency analysis. Then the group and phase velocity measures are inverted to obtain phase and group velocity maps. Finally the group and phase velocity is inverted to obtain a shear-wave 3D velocity model of the region. We show the correlation between the new velocity model ant the main tectonic features, such as the Guayana Shield and the Maturin basin.