In November/December 1987, the R/V Jean-Charcot conducted geophysical surveys (Seabeam bathymetry, single-channel seismic reflection, gravimetry and magnetism) along the northern caribbean boundary, between Cuba, Haiti and Jamaica (Pointe-a-Pitre/Santiago de Cuba/Fort-de-France). During that cruise, we focused our attention on the following themes: the transition between typical oceanic crust and thinned continental crust associated with early rifting; the structures associated with the Oriente (Bartlett) Transform Fault south of Cuba; and the eastward continuation of the Oriente Fault north of Hispaniola.