Description: The eastern part of the oceanic Cocos Plate presents a heterogeneous crustal structure due to diverse origins and ages as well as plate-hot spot interaction. The complex structure of the oceanic plate directly influences the dynamics and geometry of the subduction zone along the Middle American Trench. In this work, an integrated interpretation of the slab geometry is presented based on three-dimensional density modelling of satellite-derived gravity data constrained by seismological information obtained by local networks. Results show the continuation of steep subduction from the Nicaraguan margin into northwestern Costa Rica followed by a shallower slab under the Central Cordillera toward the end of the Central American Volcanic Arc. To the southeast of the termination of the volcanic arc, the slab appears to steepen and continue as a coherent structure until reaching the landward projection of the Panama Fracture Zone. Overall a gradual change in the depth of intra-plate seismicity is observed reaching 220 km for the northwestern part and becoming shallower toward the southeast where it reaches a maximum depth of 70-75 km. The changes in the depth of the observed seismicity correlate with changes in the density structure of the subducting slab and may indicate that differences in the state of initial hydration of the oceanic lithosphere affect the depth reached by dehydration reactions in the subduction zone.