The ebb and flow is the result of the rotation of the Earth and the gyres.
Tides are not formed along the entire coast of the seas and oceans, but only on those coasts where there is a high speed of currents.
And the higher the speed of currents along the coast, the higher the amplitude of the tidal wave.
On those coasts where the speed of currents is 0 km / h, the amplitude of the tides is also 0 meters.
The waters of the lakes, seas and oceans of the northern hemisphere rotate counterclockwise, and the waters of the southern hemisphere rotate clockwise, forming cyclonic gyres.
https://en.m.wikipedia.org/wiki/Ocean_gyre
And everything that rotates, including the cycles, has the property of a gyroscope - to maintain the vertical position of the axis in space, regardless of the rotation of the Earth.
If you look at the Earth from the side of the Sun, the gyres, rotating with the Earth, turn over twice a day, thanks to which the gyres precess (sway by 1-2 degrees) and reflect a tidal wave from themselves along the entire perimeter of the gyre.
https://goo.gl/images/M4SJq8 http://goo.gl/AM5g1s
The waters of the White Sea rotate counterclockwise, forming a huge gyroscope whirlwind, which precessing reflects the tidal wave along the entire perimeter of the White Sea. A similar pattern of tides is observed in all lakes, seas and oceans.
White Sea.
http://rivermaps.ru/doc/beloe/beloe-3.htm
http://tapemark.narod.ru/more/22.png
The waters of the Mediterranean Sea rotate counterclockwise, forming tides 10–15 cm high. In the Gulf of Gabes, off the coast of Tunisia, the height of the tides reaches three meters, and sometimes more, and this is considered one of the mysteries of nature. But at the same time, the whirlpool rotates in the Gulf of Gabes, precessing reflecting an additional tidal wave.
The tidal wave in the Amazon River creates a huge planetary circulation with a diameter of several thousand km., Rotating between South America and North Africa, covering the mouth of the Amazon River.
The pattern of movement of the tidal wave along the perimeter of the North Atlantic planetary circulation (according to satellite data).