If you're referring to streams/rivers of water that run independently of another source in the ocean these are referred to as "currents" and can be very powerful depending on their location.
They form in the ocean where undersea volcanoes are errupting. The magma turning into lava piles up on top of itself over lots of time to form land.
5 prayers a day
Salat al-fajr: dawn, before sunrise.
Salat al-zuhr: midday, after the sun passes its highest.
Salat al-'asr: the late part of the afternoon.
Salat al-maghrib: just after sunset.
Salat al-'isha: between sunset and midnight.
Answer:
20 miles, this is just me rounding around where it would be.
Explanation: