Give reasons:

The ocean currents affect the climate of a region.

The cold and warm ocean currents affect the climate of a region. The climate of a region becomes cold if a cold current flows near it such as the cold Oyashio current washes the western coast of Japan and makes it extremely cold, whereas if a warm current flows near a region, the winter becomes milder, as is the case with eastern coast of Japan which is washed by the warm Kuroshio current.