Maps of apparent lateral diffusivity K derived from surface drifters in the Pacific and Atlantic Oceans are analyzed together with mean surface circulation patterns. A remarkable feature of the diffusivity map in the Atlantic was proven to be trans-ocean belts of enhanced K in the thirties latitudes. It was shown that the North Atlantic belt is caused by the meandering and eddy-producing Azores Current, while its counterpart in the South Atlantic results from northwestward and westward drift of warm eddies produced by the Agulhas Retroflection. A puzzling feature of the diffusivity map in the Pacific was a zonally elongated tongue of high K at the center of a subtropical gyre in the Southern Hemisphere beginning from the western boundary. A similar tongue observed at the center of a subtropical gyre of the North Pacific is known to result from baroclinic instability in the seasonal North Subtropical Countercurrent (NSTCC). Both tongues were characterized by a strong and identical seasonal cycle of the eddy kinetic energy (EKE), which persuaded us to suggest an identity for the formation mechanisms that would imply the existence of southern counterpart of NSTCC: the would-be South Subtropical Countercurrent (SSTCC). A seasonal-latitudinal dependence of the mean zonal current and EKE as well as maps of the mean zonal velocity were derived from drifters that provided some evidence in favor of the existence of this SSTCC.