currents are everywhere - on land, at coasts and in oceans
Two thirds of the earth's surface are covered with water. All over the globe, a system of currents is driven by the differences in temperature and the exchange of salinity. Depending on geographic and topographic conditions different current speeds occur.
Fact is: Enormous quantities of water are continuously in motion.
Have a look at a NASA visualization of ocean surface currents.
© NASA/Goddard Space Flight Center Scientific Visualization Studio