An ocean current flowing eastward (counter to and between the westward-flowing north equatorial current and south equatorial current ) through all the oceans. In the Atlantic Ocean, it flows east across the ocean between the north and south equatorial currents across the full width of the ocean in northern summer, and across the eastern half of the ocean in northern winter. It eventually becomes the Guinea current . In the Pacific Ocean, it is one of the swiftest ocean currents; it flows east across the ocean between the latitudes 3=AE$=AFN and 10=AE$=AF= N. = East of the Philippines it is joined by the southern part of the north equatorial current. In the Indian Ocean, it flows between the north and south equatorial currents, to the east; unlike the equatorial countercurrents of the Atlantic and Pacific Oceans, it lies south of the equator. In northern summer, when the southwest monsoon forms a continuation of the southeast trade winds, the countercurrent, along with the north equatorial current, is replaced by an easterly flowing monsoon current .