Ask local watersiders, and observe ripples in the water.
You should avoid them because they are dangerous. They are able to pull you into the ocean and tire you out.
A current that runs parallel to the shoreline is called a rip tide or rip current.
rip current.
Rip current
No, you should NOT try to you swim against a rip current or rip tide. You will NOT usually make it back to shore. Instead, you should swim perpendicular to the rip. It will carry you down shore, but you'll get to shore safely.
rip current.
a rip current
Undertow.
? rip current ?
Swim parallel to the ocean shore until clear of the current
Rip current affect the shape of theass
Rip current