Maps are presented that show the distributions of the salinity, dissolved oxygen, and depth of four potential specific-volume anomaly surfaces: 125, 100, 80, and 60 cl/t. Evidence indicates an anticyclonic circulation of water at intermediate depth in the Atlantic, Pacific, and Indian oceans. Only in the South Pacific does water from the Circumpolar Current penetrate to low latitudes in a relatively unmixed condition. In the South Atlantic and South Indian oceans there is no counterpart for the poleward directed Peru-Chile Undercurrent. Low-salinity water from the Banda and Timor seas penetrates to the western South Indian Ocean on the 125-cl/t surface....