The outer channel of the Great Bahama Canyon, together with the Eleuthcra Ridge that forms its eastern boundary, has been formed by the flow of large-scale turbidity currents from the Great Bahama Canyon. The ridge consists of a series of levees that have migrated to the north and west to confine the channel against the base of the bank slope off Great Abaco Island. Deformation of the channel appears to have influenced the flow regime to the extent of creating a series of basin depressions and a major channel sill. The two large basins in the channel proper have developed in accordance with recognized principles of hydraulic behavior for flows in channels in two-layered systems. A third basin on the face of the sill is the result of the displacement of a section of the sea floor. The outer channel of the Great Bahama Canyon demonstrates features of flow behavior that have not been observed in other Ian valleys because of their setting, the sediment supplies available, or the detail of the surveys available for study.